Document
TC74AC157P/F/FT
TOSHIBA CMOS Digital Integrated Circuit Silicon Monolithic
TC74AC157P, TC74AC157F, TC74AC157FT
Quad 2-Channel Multiplexer
The TC74AC157 is an advanced high speed CMOS QUAD 2-CHANNEL MULTIPLEXER fabricated with silicon gate and double-layer metal wiring C2MOS technology.
It achieves the high speed operation similar to equivalent Bipolar Schottky TTL while maintaining the CMOS low power dissipation.
This device consist of four 2-input digital multiplexer with common select and strobe inputs.
When the STROBE input is held “H” level, selection of data is inhibited and all the outputs become “L” level.
The SELECT decoding determines whether the A or B inputs get routed to their corresponding Y outputs.
All inputs are equipped with protection circuits against static discharge or transient excess voltage.
Features
• High speed: tpd = 4.5 ns (typ.) at VCC = 5 V • Low power dissipation: ICC = 8 μA (max) at Ta = 25°C • High noise immunity: VNIH = VNIL = 28% VCC (min) • Symmetrical output impedance: |IOH| = IOL = 24 mA (min)
Capability of driving 50 Ω transmission lines. • Balanced propagation delays: tpLH ∼− tpHL • Wide operating voltage range: VCC (opr) = 2 to 5.5 V • Pin and function compatible with 74F157
TC74AC157P
TC74AC157F
TC74AC157FT
Weight DIP16-P-300-2.54A SOP16-P-300-1.27A TSSOP16-P-0044-0.65A
: 1.00 g (typ.) : 0.18 g (typ.) : 0.06 g (typ.)
Start of commercial production
1987-05
1
2014-03-01
Pin Assignment
SELECT 1 1A 2 1B 3 1Y 4 2A 5 2B 6 2Y 7
GND 8
A SG
B
A
Y
B
A
Y
B
A
YYB
(top view)
16 VCC 15 ST 14 4A 13 4B 12 4Y 11 3A 10 3B 9 3Y
Truth Table
Inputs
ST
SELECT
A
B
H
X
X
X
L
L
L
X
L
L
H
X
L
H
X
L
L
H
X
H
X: Don’t care
Output Y L L H L H
TC74AC157P/F/FT
IEC Logic Symbol
ST (15) EN SELECT (1) G1
1A (2) 1B (3) 2A (5)
1 MUX 1
2B (6)
3A (11)
3B (10)
4A (14)
4B (13)
(4) 1Y (7) 2Y (9) 3Y (12) 4Y
2
2014-03-01
System Diagram
TC74AC157P/F/FT
1 SELECT
15 ST
2 1A
1B
3
5 2A
2B
6
11 3A
3B
10
14 4A
4B
13
φ φ
φ φ φ φ φ φ φ φ
4 1Y
7 2Y
9 3Y
12 4Y
Absolute Maximum Ratings (Note 1)
Characteristics
Symbol
Rating
Unit
Supply voltage range DC input voltage DC output voltage Input diode current Output diode current DC output current DC VCC/ground current Power dissipation Storage temperature
VCC VIN VOUT IIK IOK IOUT ICC PD Tstg
−0.5 to 7.0
V
−0.5 to VCC + 0.5
V
−0.5 to VCC + 0.5
V
±20
mA
±50
mA
±50
mA
±100
mA
500 (DIP) (Note 2)/180 (SOP/TSSOP)
mW
−65 to 150
°C
Note 1: Exceeding any of the absolute maximum ratings, even briefly, lead to deterioration in IC performance or even destruction. Using continuously under heavy loads (e.g. the application of high temperature/current/voltage and the significant change in temperature, etc.) may cause this product to decrease in the reliability significantly even if the operating conditions (i.e. operating temperature/current/voltage, etc.) are within the absolute maximum ratings and the operating ranges. Please design the appropriate reliability upon reviewing the Toshiba Semiconductor Reliability Handbook (“Handling Precautions”/Derating Concept and Methods) and individual reliability data (i.e. reliability test report and estimated failure rate, etc).
Note 2: 500 mW in the range of Ta = −40 to 65°C. From Ta = 65 to 85°C, a derating factor of −10 mW/°C should be applied up to 300 mW.
3
2014-03-01
Operating Ranges (Note)
TC74AC157P/F/FT
Characteristics
Symbol
Rating
Unit
Supply voltage Input voltage Output voltage Operating temperature
Input rise and fall time
VCC VIN VOUT Topr
dt/dV
2.0 to 5.5 0 to VCC 0 to VCC −40 to 85 0 to 100 (VCC = 3.3 ± 0.3 V) 0 to 20 (VCC = 5 ± 0.5 V)
V V V °C
ns/V
Note: The operating ranges must be maintained to ensure the normal operation of the device. Unused inputs must be tied to either VCC or GND.
Electrical Characteristics
DC Characteristics
Characteristics
Symbol
High-level input voltage
VIH
Test Condition ―
Ta = 25°C
Ta =
−40 to 85°C
Unit
VCC (V)
Min
Typ.
Max
Min
Max
2.0 1.50 ―
― 1.50 ―
3.0 2.10 ―
― 2.10 ―
V
5.5 3.85 ―
― 3.85 ―
Low-level input voltage
VIL
2.0 ―
― 0.50 ― 0.50
―
3.0 ―
― 0.90
― 0.90
V
5.5 ―
― 1.65 ― 1.65
2.0 1.9 2.0
―
1.9
―
High-level output voltage
VOH
IOH = −50 μA
VIN
= VIH or
VIL
IOH = −4 mA
IOH = −24 mA
3.0 2.9 3.0
―
2.9
―
4.5 4.4 4.5
―
4.4
―
V
3.0 2.58 ―
― 2.48 ―
4.5 3.94 ―
― 3.80 ―
IOH = −75 mA (Note) 5.5 ―
―
― 3.85 ―
2.0 ―
0.0 0.1
―
0.1
Low-level output voltage
Input leakage current
IOL = 50 μA
VIN
VOL
= VIH or
VIL
IOL = 12 mA
3.0 ―
0.0 0.1
―
0.1
4.5 ―
0.0 0.1
―
0.1
V
3.0 ―
― 0.36 ― 0.44
IOL = 24 mA
4.5 ―
― 0.36 ― 0.44
IOL = 75 mA (Note) 5.5 ―
―
―
― 1.65
IIN
VIN = VCC or GND
5.5 ―
― ±0.1 ― ±1.0 μA
Quiescent supply .