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74LVC138AD-74LVC138ADB-74LVC138APWDH
3-to-8 line decoder/demultiplexer; inverting
Product specification 1998 Apr 28
Philips Semiconductors Product specification
74LVC138A3-to-8 line decoder/demultiplexer; inverting
FEATURES Wide supply voltage range of 1.2 to 3.6 V In accordance with JEDEC standard no. 8-1A Inputs accept voltages up to 5.5 V CMOS lower power consumption Direct interface with TTL levels Demultiplexing capability Multiple input enable for easy expansion Ideal for memory chip select decoding Active LOW mutually exclusive outputs Output drive capability 50 transmission lines at 85°C
DESCRIPTIONThe 74LVC138A is a low-voltage, low-power, high-performance
Si-gate CMOS device, superior to most advanced CMOS
compatible TTL families.
The 74LVC138A accepts three binary weighted address inputs (A0,
A1, A2) and when enabled, provides 8 mutually exclusive active
LOW outputs (Y0 to Y7).
The 74LVC138A features three enable inputs: two active LOW (E1
and E2) and one active HIGH (E3). Every output will be HIGH unless
E1 and E2 are LOW and E3 is HIGH.
This multiple enable function allows easy parallel expansion of the
74LV138A to a 1-of-32 (5 lines to 32 lines) decoder with just four
74LV138A ICs and one inverter. The 74LV138A can be used as an
eight output demultiplexer by using one of the active LOW enable
inputs as the data input and the remaining enable inputs as strobes.
Unused enable inputs must be permanently tied to their appropriate
active HIGH or LOW state.
QUICK REFERENCE DATAGND = 0 V; Tamb = 25°C; tr = tf ≤ 2.5 ns
NOTES: CPD is used to determine the dynamic power dissipation (PD in μW)
PD = CPD × VCC2 × fi (CL × VCC2 × fo) where:
fi = input frequency in MHz; CL = output load capacity in pF;
fo = output frequency in MHz; VCC = supply voltage in V;
(CL × VCC 2 × fo) = sum of the outputs. The condition is VI = GND to VCC
ORDERING INFORMATION
PIN CONFIGURATION
LOGIC DIAGRAM
Philips Semiconductors Product specification
74LVC138A3-to-8 line decoder/demultiplexer; inverting
PIN DESCRIPTION
LOGIC SYMBOL (IEEE/IEC)
FUNCTIONAL DIAGRAM
FUNCTION TABLE
NOTES:H = HIGH voltage level
L = LOW voltage level
X = don’t care
Philips Semiconductors Product specification
74LVC138A3-to-8 line decoder/demultiplexer; inverting
RECOMMENDED OPERATING CONDITIONS
ABSOLUTE MAXIMUM RATINGS1In accordance with the Absolute Maximum Rating System (IEC 134).
Voltages are referenced to GND (ground = 0V).
NOTES: Stresses beyond those listed may cause permanent damage to the device. These are stress ratings only and functional operation of the
device at these or any other conditions beyond those indicated under “recommended operating conditions” is not implied. Exposure to
absolute-maximum-rated conditions for extended periods may affect device reliability. The input and output voltage ratings may be exceeded if the input and output current ratings are observed.
Philips Semiconductors Product specification
74LVC138A3-to-8 line decoder/demultiplexer; inverting
DC ELECTRICAL CHARACTERISTICSOver recommended operating conditions. Voltages are referenced to GND (ground = 0V).
NOTE: All typical values are at VCC = 3.3V and Tamb = 25°C.
AC CHARACTERISTICSGND = 0 V; tr = tf � 2.5 ns; CL = 50 pF; RL = 500; Tamb = –40C to +85C
NOTE: These typical values are at VCC = 3.3V and Tamb = 25°C.
Philips Semiconductors Product specification
74LVC138A3-to-8 line decoder/demultiplexer; inverting
AC WAVEFORMSVM = 1.5 V at VCC � 2.7 V
VM = 0.5 � VCC at VCC < 2.7 V
VOL and VOH are the typical output voltage drop that occur with the
output load.
Figure 1. Input (nA) to output (nY) propagation delays.
Figure 2. 3-State enable and disable times.
TEST CIRCUIT
Figure 3. Load circuitry for switching times.
