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74HC251D
8-input multiplexer; 3-state
1. General description
The 74HC251; 74HCT251 is an 8-bit multiplexer with eight binary inputs (I0 to I7), three
select inputs (S0 to S2) and an output enable input (OE). The select inputs select one of
the eight binary inputs and route it to the complementary outputs (Y and Y). A HIGH on
OE causes the outputs to assume a high-impedance OFF-state. Inputs include clamp
diodes that enable the use of current limiting resistors to interface inputs to voltages in
excess of VCC.
2. Features and benefits Input levels: For 74HC251: CMOS level For 74HCT251: TTL level Low-power dissipation Non-inverting data path Specified in compliance with JEDEC standard no. 7A ESD protection: HBM JESD22-A114F exceeds 2000V MM JESD22-A115-A exceeds 200V Multiple package options Specified from 40 C to +85 C and from 40 C to +125C
3. Ordering information
74HC251; 74HCT251
8-input multiplexer; 3-state
Rev. 3 — 9 July 2013 Product data sheet
Table 1. Ordering information
74HC251N 40 C to +125C DIP16 plastic dual in-line package; 16 leads (300 mil) SOT38-4
74HCT251N
74HC251D 40 C to +125 C SO16 plastic small outline package; 16 leads; body width
3.9 mm
SOT109-1
74HCT251D
74HC251DB 40 C to +125C SSOP16 plastic shrink small outline package; 16 leads;
body width 5.3 mm
SOT338-1
74HCT251DB
74HC251PW 40 C to +125 C TSSOP16 plastic thin shrink small outline package; 16 leads;
body width 4.4 mm
SOT403-1
74HCT251PW
NXP Semiconductors 74HC251; 74HCT251
8-input multiplexer; 3-state
4. Functional diagram
NXP Semiconductors 74HC251; 74HCT251
8-input multiplexer; 3-state
5. Pinning information
5.1 Pinning
5.2 Pin description
Table 2. Pin description
I0 to I7 4, 3, 2, 1, 15, 14, 13, 12 data inputs 5 multiplexer output 6 complementary multiplexer output 7 output enable input (active LOW)
GND 8 ground (0V)
S0, S1, S2 11, 10, 9 common data select inputs
VCC 16 supply voltage
NXP Semiconductors 74HC251; 74HCT251
8-input multiplexer; 3-state
6. Functional description
[1] H= HIGH voltage level; L= LOW voltage level; X= don’t care; Z = high-impedance OFF-state.
7. Limiting values
Table 3. Function table[1] X XXX XXX XXX XZ Z L L L L XXX XXX XH L L L L H XXX XXX XL H L L H X L XX XXX XH L L L H X H XX XXX XL H L H L X XL X XXX XH L L H L X XH X XXX XL H L H H X XXL XXX XH L L H H X XXH XXX XL H LLX X X X LX X X H L LLX X X X H X X X LH H L H X XXX XL X XH L LH X X X X X H X X LH H H L X XXX XXL XH L H H L X XXX XXH XL H H H H X XXX XXX L H L H H H X XXX XXX H L H
Table 4. Limiting values
In accordance with the Absolute Maximum Rating System (IEC 60134). Voltages are referenced to GND (ground = 0 V).
VCC supply voltage 0.5 +7 V
IIK input clamping current VI < 0.5 V or VI >VCC +0.5 V - 20 mA
IOK output clamping current VO< 0.5 V or VO >VCC +0.5V - 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
NXP Semiconductors 74HC251; 74HCT251
8-input multiplexer; 3-state
[1] For DIP16 package: Ptot derates linearly with 12 mW/K above 70 C.
[2] For SO16 package: Ptot derates linearly with 8 mW/K above 70 C.
[3] For SSOP16 and TSSOP16 packages: Ptot derates linearly with 5.5 mW/K above 60 C.
8. Recommended operating conditions
Ptot total power dissipation Tamb = 40 C to +125C
DIP16 package [1]- 750 mW
SO16 package [2]- 500 mW
(T)SSOP16 package [3]- 500 mW
Table 4. Limiting values …continued
In accordance with the Absolute Maximum Rating System (IEC 60134). Voltages are referenced to GND (ground = 0 V).
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 +25 +125 40 +25 +125 C
t/V 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
NXP Semiconductors 74HC251; 74HCT251
8-input multiplexer; 3-state
9. Static characteristicsTable 6. Static characteristics
At recommended operating conditions; voltages are referenced to GND (ground=0V).
74HC251
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 =VIHorVIL= 20 A; VCC= 2.0V 1.9 2.0 - 1.9 - 1.9 - V= 20 A; VCC= 4.5V 4.4 4.5 - 4.4 - 4.4 - V= 20 A; VCC= 6.0V 5.9 6.0 - 5.9 - 5.9 - V= 4.0 mA; VCC= 4.5V 3.98 4.32 - 3.84 - 3.7 - V= 5.2 mA; VCC= 6.0V 5.48 5.81 - 5.34 - 5.2 - V
VOL LOW-level
output voltage =VIHorVIL =20 A; VCC= 2.0V - 0 0.1 - 0.1 - 0.1 V =20 A; VCC= 4.5V - 0 0.1 - 0.1 - 0.1 V =20 A; VCC= 6.0V - 0 0.1 - 0.1 - 0.1 V= 4.0 mA; VCC= 4.5V - 0.15 0.26 - 0.33 - 0.4 V= 5.2 mA; VCC= 6.0V - 0.16 0.26 - 0.33 - 0.4 V input leakage
current =VCCor GND;
VCC =6.0V 0.1 - 1.0 - 1.0 A
IOZ OFF-state
output current =VIHor VIL; =VCCor GND;
VCC =6.0V 0.5 - 5.0 - 10.0 A
ICC supply current VI =VCCor GND; IO =0A;
VCC =6.0V - 8.0 - 80 - 160 A input
capacitance
-3.5 - pF
NXP Semiconductors 74HC251; 74HCT251
8-input multiplexer; 3-state
74HCT251
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 =VIHor VIL; VCC =4.5V= 20A 4.4 4.5 - 4.4 - 4.4 - V=4 mA 3.98 4.32 - 3.84 - 3.7 - V
VOL LOW-level
output voltage =VIHor VIL; VCC =4.5V =20A - 0 0.1 - 0.1 - 0.1 V= 4.0 mA - 0.15 0.26 - 0.33 - 0.4 V input leakage
current =VCCor GND;
VCC =5.5V 0.1 - 1.0 - 1.0 A
IOZ OFF-state
output current =VIHor VIL; VCC =5.5V; =VCC or GND per input
pin; other inputs at VCC or
GND; IO =0A 0.5 - 5.0 - 10 A
ICC supply current VI =VCCor GND; IO =0A;
VCC =5.5V - 8.0 - 80 - 160 A
ICC additional
supply current =VCC 2.1V;
other inputs at VCCor GND;
VCC= 4.5Vto 5.5V; =0A
per input pin; In inputs - 100 360 - 450 - 490 A
per input pin; OE input - 150 540 - 675 - 735 A
per input pin; Sn input - 150 540 - 675 - 735 A input
capacitance
-3.5 - pF
Table 6. Static characteristics …continued
At recommended operating conditions; voltages are referenced to GND (ground=0V).
NXP Semiconductors 74HC251; 74HCT251
8-input multiplexer; 3-state
10. Dynamic characteristicsTable 7. Dynamic characteristics
Voltages are referenced to GND (ground =0 V); CL = 50 pF unless otherwise specified; for test circuit, see Figure 10.
74HC251
tpd propagation
delayto Y; see Figure7 [1]
VCC = 2.0 V - 50 170 - 215 - 255 ns
VCC = 4.5 V - 18 34 - 43 - 51 ns
VCC =5V; CL =15pF - 15 - - - - - ns
VCC = 6.0 V - 14 29 - 37 - 43 nsto Y; see Figure7 [1]
VCC = 2.0 V - 55 175 - 220 - 265 ns
VCC = 4.5 V - 20 35 - 44 - 53 ns
VCC =5V; CL =15pF - 17 - - - - - ns
VCC = 6.0 V - 16 30 - 37 - 45 ns
Sn to Y; see Figure8 [1]
VCC = 2.0 V - 66 205 - 255 - 310 ns
VCC = 4.5 V - 24 41 - 51 - 62 ns
VCC =5V; CL =15pF - 20 - - - - - ns
VCC = 6.0 V - 19 35 - 43 - 53 ns
Sn to Y; see Figure8 [1]
VCC = 2.0 V - 69 205 - 255 - 310 ns
VCC = 4.5 V - 25 41 - 51 - 62 ns
VCC =5V; CL =15pF - 21 - - - - - ns
VCC = 6.0 V - 20 35 - 43 - 53 ns
ten enable time OE to Y, Y; see Figure8 [2]
VCC = 2.0 V - 36 140 - 175 - 210 ns
VCC = 4.5 V - 13 28 - 35 - 42 ns
VCC = 6.0 V - 10 24 - 30 - 36 ns
tdis disable time OE to Y, Y; see Figure8 [3]
VCC = 2.0 V - 39 140 - 170 - 210 ns
VCC = 4.5 V - 14 28 - 35 - 42 ns
VCC = 6.0 V - 11 24 - 30 - 36 ns transition
time
Y, Y; see Figure7 [4]
VCC = 2.0 V - 19 75 - 95 - 110 ns
VCC = 4.5 V - 7 15 - 19 - 22 ns
VCC = 6.0 V - 6 13 - 16 - 19 ns
CPD power
dissipation
capacitance=50 pF;f= 1 MHz; =GNDto VCC
[5] -44 - - - - - pF
NXP Semiconductors 74HC251; 74HCT251
8-input multiplexer; 3-state
[1] tpd is the same as tPLH and tPHL.
[2] ten is the same as tPZH and tPZL.
[3] tdis is the same as tPLZ and tPHZ.
[4] tt is the same as tTHL and tTLH.
[5] CPD is used to determine the dynamic power dissipation (PD in W). =CPD VCC2fi N+ (CL VCC2 fo) where:
fi = input frequency in MHz;= output frequency in MHz;= output load capacitance in pF;
VCC = supply voltage in V;= number of inputs switching;
(CL VCC2fo)= sum of outputs.
74HCT251
tpd propagation
delay
In to Y; see Figure7 [1]
VCC = 4.5 V - 22 35 - 44 - 53 ns
VCC =5V; CL =15pF - 19 - - - - - ns
In to Y; see Figure7 [1]
VCC = 4.5 V - 22 35 - 44 - 53 ns
VCC =5V; CL =15pF - 19 - - - - - nsto Y; see Figure8 [1]
VCC = 4.5 V - 24 44 - 55 - 66 ns
VCC =5V; CL =15pF - 20 - - - - - ns
Sn to Y; see Figure8 [1]
VCC = 4.5 V - 25 44 - 55 - 66 ns
VCC =5V; CL =15pF - 21 - - - - - ns
ten enable time OEto Y, Y; see Figure8 [2]
VCC = 4.5 V - 13 28 - 35 - 42 ns
VCC =5V; CL =15pF - 13 - - - - - ns
tdis disable time OEto Y, Y; see Figure8 [3]
VCC = 4.5 V - 14 28 - 35 - 42 ns
VCC =5V; CL =15pF - 18 - - - - - ns transition
time
Y, Y; see Figure7 [4]
VCC = 4.5 V - 7 15 - 19 - 22 ns
CPD power
dissipation
capacitance=50 pF;f= 1 MHz; =GNDto VCC
[5] -46 - - - - - pF
Table 7. Dynamic characteristics …continued
Voltages are referenced to GND (ground =0 V); CL = 50 pF unless otherwise specified; for test circuit, see Figure 10.
NXP Semiconductors 74HC251; 74HCT251
8-input multiplexer; 3-state
11. Waveforms
