74HCT4538PW Fast Delivery |IC PHOENIX CO.,LIMITED

74HCT4538PW ,Dual retriggerable precision monostable multivibratorGENERAL DESCRIPTIONwidth (T) is equal to 0.7 × R × C . The linear designt ttechniques guarantee pre ..
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74HCT4538PW
Dual retriggerable precision monostable multivibrator
General descriptionThe 74HC4538; 74HCT4538 are high-speed Si-gate CMOS devices and are pin
compatible with Low-power Schottky TTL (LSTTL). They are speciﬁedin compliance with
JEDEC standard no. 7A.
The 74HC4538; 74HCT4538 are dual retriggerable-resettable monostable multivibrators.
Each multivibrator has an active LOW trigger/retrigger input (nA), an active HIGH
trigger/retrigger input (nB), an overriding active LOW direct reset input (nCD), an output
(nQ) and its complement (nQ), and two pins (nREXT/CEXT and nCEXT) for connecting
the external timing components CEXT and REXT. Typical pulse width variation over the
speciﬁed temperature range is ±0.2 %.
The multivibrator maybe triggeredby either the positiveor the negative edgesof the input
pulse. The duration and accuracy of the output pulse are determined by the external
timing components CEXT and REXT. The output pulse width (tW) is equal to
0.7× REXT× CEXT. The linear design techniques guarantee precise control of the output
pulse width.A LOW levelat nCD terminates the output pulse immediately. Schmitt trigger
action on pins nA and nB makes the circuit highly tolerant of slower rise and fall times. Features Tolerant of slow trigger rise and fall times Separate reset inputs Triggering from falling or rising edge Multiple package options ESD protection: HBM JESD22-A114E exceeds 2000V MM JESD22-A115-A exceeds 200V Speciﬁed from −40 °Cto+85 °C and from −40°Cto +125°C
74HC4538; 74HCT4538
Dual retriggerable precision monostable multivibrator
Rev. 03 — 8 June 2009 Product data sheet
NXP Semiconductors 74HC4538; 74HCT4538
Dual retriggerable precision monostable multivibrator Ordering information Functional diagram
Table 1. Ordering information
74HC4538N −40 °C to +125°C DIP16 plastic dual in-line package; 16-leads (300 mil) SOT38-4
74HCT4538N
74HC4538D −40 °C to +125°C SO16 plastic small outline package;16 leads; body width 3.9 mm SOT109-1
74HCT4538D
74HC4538DB −40 °C to +125°C SSOP16 plastic shrink small outline package; 16 leads;
body width 5.3 mm
SOT338-1
74HCT4538DB
74HC4538PW −40 °C to +125°C TSSOP16 plastic thin shrink small outline package; 16 leads;
body width 4.4 mm
SOT403-1
74HCT4538PW
NXP Semiconductors 74HC4538; 74HCT4538
Dual retriggerable precision monostable multivibrator
NXP Semiconductors 74HC4538; 74HCT4538
Dual retriggerable precision monostable multivibrator Pinning information
5.1 Pinning
5.2 Pin description
Table 2. Pin description
1CEXT, 2CEXT 1, 15 external capacitor connection (always connected to ground)
1REXT/CEXT, 2REXT/CEXT 2, 14 external capacitor/resistor connection
1CD, 2CD 3, 13 direct reset input (active LOW)
1B, 2B 4, 12 input (LOW to HIGH triggered)
1A, 2A 5, 11 input (HIGH to LOW triggered)
1Q, 2Q 6, 10 output
1Q, 2Q 7, 9 complementary output (active LOW)
GND 8 ground (0 V)
VCC 16 supply voltage
NXP Semiconductors 74HC4538; 74HCT4538
Dual retriggerable precision monostable multivibrator Functional description
[1] H = HIGH voltage level; L = LOW voltage level; X = don’t care;
↑ = positive-going transition;↓= negative-going transition;
= one HIGH level output pulse, with the pule width determined by CEXT and REXT;
= one LOW level output pulse, with the pulse width determined by CEXT and REXT.
Table 3. Function table LH ↑ H X LLH
NXP Semiconductors 74HC4538; 74HCT4538
Dual retriggerable precision monostable multivibrator Limiting values
[1] The input and output voltage ratings may be exceeded if the input and output current ratings are observed.
[2] Ptot derates linearly with 12 mW/K above 70°C.
[3] Ptot derates linearly with 8 mW/K above 70°C.
[4] Ptot derates linearly with 5.5 mW/K above 60°C.
Table 4. Limiting values
In accordance with the Absolute Maximum Rating System (IEC 60134). Voltages are referenced to GND (ground = 0V).
VCC supply voltage −0.5 +7.0 V
IIK input clamping current VI < −0.5 V or VI >VCC+ 0.5 V [1]- ±20 mA
IOK output clamping current VO < −0.5 V or VO > VCC + 0.5V [1]- ±20 mA output current VO = −0.5 V to VCC+ 0.5V - ±25 mA
ICC supply current - +50 mA
IGND ground current −50 - mA
Tstg storage temperature −65 +150 °C
Ptot total power dissipation Tamb = −40 °C to +125°C
DIP16 package [2]- 750 mW
SO16 package [3]- 500 mW
(T)SSOP16 package [4]- 500 mW
NXP Semiconductors 74HC4538; 74HCT4538
Dual retriggerable precision monostable multivibrator Recommended operating conditions Static characteristics
Table 5. Recommended operating conditions
Voltages are referenced to GND (ground = 0V)
VCC supply voltage 2.0 5.0 6.0 4.5 5.0 5.5 V input voltage 0 - VCC 0- VCC V output voltage 0 - VCC 0- VCC V
Tamb ambient temperature −40 - +125 −40 - +125 °C
Δt/ΔV input transition rise and fall rate VCC = 2.0 V - - 625 - - - ns/V
VCC = 4.5 V - 1.67 139 - 1.67 139 ns/V
VCC = 6.0 V - - 83 - - - ns/V
Table 6. Static characteristics
At recommended operating conditions; voltages are referenced to GND (ground=0V).
74HC4538
VIH HIGH-level
input voltage
VCC = 2.0V 1.5 1.2 - 1.5 - 1.5 - V
VCC = 4.5V 3.15 2.4 - 3.15 - 3.15 - V
VCC = 6.0V 4.2 3.2 - 4.2 - 4.2 - V
VIL LOW-level
input voltage
VCC = 2.0V - 0.8 0.5 - 0.5 - 0.5 V
VCC = 4.5V - 2.1 1.35 - 1.35 - 1.35 V
VCC = 6.0V - 2.8 1.8 - 1.8 - 1.8 V
VOH HIGH-level
output voltage
VI = VIH or VIL
IO = −20 μA; VCC = 2.0V 1.9 2.0 - 1.9 - 1.9 - V
IO = −20 μA; VCC = 4.5V 4.4 4.5 - 4.4 - 4.4 - V
IO = −20 μA; VCC = 6.0V 5.9 6.0 - 5.9 - 5.9 - V
IO = −4.0 mA; VCC = 4.5V 3.98 4.32 - 3.84 - 3.7 - V
IO = −5.2 mA; VCC = 6.0V 5.48 5.81 - 5.34 - 5.2 - V
VOL LOW-level
output voltage
VI = VIH or VIL
IO = 20 μA; VCC = 2.0V - 0 0.1 - 0.1 - 0.1 V
IO = 20 μA; VCC = 4.5V - 0 0.1 - 0.1 - 0.1 V
IO = 20 μA; VCC = 6.0V - 0 0.1 - 0.1 - 0.1 V
IO = 4.0 mA; VCC = 4.5V - 0.15 0.26 - 0.33 - 0.4 V
IO = 5.2 mA; VCC = 6.0V - 0.16 0.26 - 0.33 - 0.4 V input leakage
current
VI = VCC or GND;
VCC= 6.0V ±0.1 - ±1- ±1 μA
pin nREXT/CEXT;= 2.0V or GND; other
inputs at VCC or GND;
VCC= 6.0V[1] ±0.5 - ±5- ±10 μA
NXP Semiconductors 74HC4538; 74HCT4538
Dual retriggerable precision monostable multivibrator
[1] This measurement can only be carried out after a trigger pulse is applied.
ICC supply current VI = VCC or GND; IO =0A;
VCC= 6.0V - 8.0 - 80 - 160 μA input
capacitance 3.5 - - - - - pF
74HCT4538
VIH HIGH-level
input voltage
VCC = 4.5 V to 5.5V 2.0 1.6 - 2.0 - 2.0 - V
VIL LOW-level
input voltage
VCC = 4.5 V to 5.5V - 1.2 0.8 - 0.8 - 0.8 V
VOH HIGH-level
output voltage
VI = VIH or VIL; VCC = 4.5V
IO = −20μA 4.4 4.5 - 4.4 - 4.4 - V
IO = −4.0 mA 3.98 4.32 - 3.84 - 3.7 - V
VOL LOW-level
output voltage
VI = VIH or VIL; VCC = 4.5V
IO = 20 μA; VCC = 4.5V - 0 0.1 - 0.1 - 0.1 V
IO = 4.0 mA; VCC = 4.5V - 0.15 0.26 - 0.33 - 0.4 V input leakage
current
VI = VCC or GND;
VCC= 5.5V ±0.1 - ±1- ±1 μA
pin nREXT/CEXT;= 2.0V or GND; other
inputs at VCC or GND;
VCC= 5.5V[1] ±0.5 - ±5- ±10 μA
ICC supply current VI = VCC or GND; IO =0A;
VCC= 5.5V - 8.0 - 80 - 160 μA
ΔICC additional
supply current =VCC− 2.1 V; IO =0A;
other inputsat VCCor GND;
VCC= 4.5Vto 5.5V
pin nA, nB - 50 180 - 225 - 245 μA
pin nCD - 65 234 - 293 - 319 μA input
capacitance 3.5 - - - - - pF
Table 6. Static characteristics …continued
At recommended operating conditions; voltages are referenced to GND (ground=0V).
NXP Semiconductors 74HC4538; 74HCT4538
Dual retriggerable precision monostable multivibrator
10. Dynamic characteristics
Table 7. Dynamic characteristics
Voltages are referenced to GND (ground = 0 V); for test circuit see Figure9.
74HC4538
tPLH LOW to HIGH
propagation
delay
nA, nB to nQ;
see Figure7
VCC = 2.0 V - 85 265 - 330 - 400 ns
VCC = 4.5 V - 31 53 - 66 - 80 ns
VCC = 5.0 V; CL=15pF - 27----- ns
VCC = 6.0 V - 25 45 - 56 - 68 ns
nCD to nQ; see Figure7
VCC = 2.0 V - 83 265 - 340 - 400 ns
VCC = 4.5 V - 30 53 - 68 - 80 ns
VCC = 6.0 V - 24 45 - 58 - 68 ns
tPHL HIGH to LOW
propagation
delay
nA, nB to nQ;
see Figure7
VCC = 2.0 V - 83 265 - 330 - 400 ns
VCC = 4.5 V - 30 53 - 66 - 80 ns
VCC = 5.0 V; CL=15pF - 27----- ns
VCC = 6.0 V - 24 45 - 56 - 68 ns
nCD to nQ; see Figure7
VCC = 2.0 V - 80 265 - 330 - 400 ns
VCC = 4.5 V - 29 53 - 66 - 80 ns
VCC = 6.0 V - 23 45 - 56 - 68 ns transition time nQ and nQ; see Figure7 [2]
VCC = 2.0 V - 19 75 - 95 - 119 ns
VCC = 4.5 V - 7 15 - 19 - 22 ns
VCC = 6.0 V - 6 13 - 16 - 19 ns
NXP Semiconductors 74HC4538; 74HCT4538
Dual retriggerable precision monostable multivibrator pulse width nA LOW; see Figure8
VCC = 2.0 V 80 17 - 100 - 120 - ns
VCC = 4.5 V 16 6 - 20 - 24 - ns
VCC = 6.0 V 14 5 - 17 - 20 - ns
nB HIGH; see Figure8
VCC = 2.0 V 80 17 - 100 - 120 - ns
VCC = 4.5 V 16 6 - 20 - 24 - ns
VCC = 6.0 V 14 5 - 17 - 20 - ns
nCD LOW; see Figure8
VCC = 2.0 V 80 19 - 100 - 120 - ns
VCC = 4.5 V 16 7 - 20 - 24 - ns
VCC = 6.0 V 14 6 - 17 - 20 - ns andnQ HIGHor LOW;
see Figure8
VCC = 5.0 V;
CEXT= 0.1 μF;
REXT= 10 kΩ
630 700 770 602 798 595 805 μs
trec recovery time nCD to nA, nB;
see Figure8
VCC = 2.0 V 35 6 - 45 - 55 - ns
VCC = 4.5 V 7 2 - 9 - 11 - ns
VCC = 6.0 V 6 2 - 8 - 9 - ns
trtrig retrigger time nA, nB; see Figure8;
X=CEXT/ (4.5 × VCC)
VCC = 2.0 V - 455+X ----- ns
VCC = 4.5 V - 80+X ----- ns
VCC = 6.0 V - 55+X ----- ns
REXT externaltiming
resistor
VCC = 2.0 V 10 - 1000 ---- kΩ
VCC = 5.0 V 2 - 1000 ---- kΩ
CEXT externaltiming
capacitor
no limits
CPD power
dissipation
capacitance
per multivibrator;= GNDto VCC
[3] - 136 ----- pF
Table 7. Dynamic characteristics …continued
Voltages are referenced to GND (ground = 0 V); for test circuit see Figure9.
NXP Semiconductors 74HC4538; 74HCT4538
Dual retriggerable precision monostable multivibrator
74HCT4538
tPLH LOW to HIGH
propagation
delay
nA, nB to nQ;
see Figure7
VCC = 4.5 V - 35 60 - 75 - 90 ns
VCC = 5.0 V; CL=15pF - 30----- ns
nCD to nQ; see Figure7
VCC = 4.5 V - 35 60 - 75 - 90 ns
tPHL HIGH to LOW
propagation
delay
nA, nB to nQ;
see Figure7
VCC = 4.5 V - 35 60 - 75 - 90 ns
VCC = 5.0 V; CL=15pF - 30----- ns
nCD to nQ; see Figure7
VCC = 4.5 V - 35 60 - 75 - 90 ns transition time nQ and nQ; see Figure7 [2]
VCC = 4.5 V - 7 15 - 19 - 21 ns pulse width nA LOW; see Figure8
VCC = 4.5 V 20 11 - 25 - 30 - ns
nB HIGH; see Figure8
VCC = 4.5 V 16 5 - 20 - 24 - ns
nCD LOW; see Figure8
VCC = 4.5 V 20 11 - 25 - 30 - ns andnQ HIGHor LOW;
see Figure8
VCC = 5.0 V;
CEXT= 0.1 μF;
REXT= 10 kΩ
630 700 770 602 798 595 805 μs
trec recovery time nCD to nA, nB;
see Figure8
VCC = 4.5 V 7 2 - 9 - 11 - ns
trtrig retrigger time nA, nB; see Figure8;
X=CEXT/ (4.5 × VCC)
VCC = 4.5 V - 80+X ----- ns
REXT externaltiming
resistor
VCC = 5.0 V 2 - 1000 ---- kΩ
CEXT externaltiming
capacitor
VCC = 5.0 V no limits
Table 7. Dynamic characteristics …continued
Voltages are referenced to GND (ground = 0 V); for test circuit see Figure9.
NXP Semiconductors 74HC4538; 74HCT4538
Dual retriggerable precision monostable multivibrator
[1] Typical values are measured at nominal supply voltage (VCC=3.3 V and VCC=5.0V).
[2] tt is the same as tTHL and tTLH.
[3] CPDis used to determine the dynamic power dissipation (PD in μW). =CPD× VCC2×fi ×Σ(CL× VCC2×fo) + 0.48 × CEXT × VCC2 × fo + D × 0.8 × VCC where:= input frequency in MHz;= output frequency in MHz;
Σ(CL× VCC2×fo)= sum of the outputs;= output load capacitance inpF;
VCC= supply voltage in V;= duty cycle factor in %;
CEXT= external timing capacitance in pF.
11. Waveforms
CPD power
dissipation
capacitance
per multivibrator;= GNDto (VCC− 1.5V)
[3] - 138 ----- pF
Table 7. Dynamic characteristics …continued
Voltages are referenced to GND (ground = 0 V); for test circuit see Figure9.

Partno	Mfg	Dc	Qty	Available	Descript
74HCT4538PW	NXP	N/a	13368	avai	Dual retriggerable precision monostable multivibrator