TC74LCX157F/FN/FT/FK
2010-01-31
1
TOSHIBA CMOS Digital Integrated Circuit Silicon Monolithic
TC74LCX157F,TC74LCX157FN,TC74LCX157FT,TC74LCX157FK
Low Voltage Quad 2-Channel Multiplexer with 5 V Tolerant Inputs and Outputs
The TC74LCX157 is a high-performance CMOS multiplexer.
Designed for use in 3.3-V systems, it achieves high-speed
operation while maintaining the CMOS low power dissipation.
The device is designed for low-voltage (3.3 V) VCC applications,
but it could be used to interface to 5-V supply environment for
inputs.
It consists of four 2-input digital multiplexers with common
SELECT and ST inputs. When the ST 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.
Features
• Low-voltage operation: VCC = 1.65 to 3.6 V
• High-speed operation: tpd = 5.8 ns (max) (VCC = 3.0 to 3.6 V)
• Ouput current: |IOH|/IOL = 24 mA (min) (VCC = 3.0 V)
• Latch-up performance: ＞±500 mA
• Available in JEDEC SOP, JEITA SOP, TSSOP and
VSSOP (US)
• Power-down protection provided on all inputs and outputs
• Pin and function compatible with the 74 series
(74AC/VHC/HC/F/ALS/LS etc.) 157 type
Weight
SOP16-P-300-1.27A : 0.18 g (typ.)
SOL16-P-150-1.27 : 0.12 g (typ.)
TSSOP16-P-0044-0.65A : 0.06 g (typ.)
VSSOP16-P-0030-0.50 : 0.02 g (typ.)
Note: The Electrical Characteristics of VCC=1.8±0.15V is only applicable for products which manufactured
from January 2009 onward.
Note: xxxFN (JEDEC SOP) is not available in
Japan.
TC74LCX157F
TC74LCX157FN
TC74LCX157FT
TC74LCX157FK
TC74LCX157F/FN/FT/FK
2010-01-31
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Pin Assignment (top view) IEC Logic Symbol
Truth Table
Inputs Outputs
ST SELECT A B Y
H X X X L
L L L X L
L L H X H
L H X L L
L H X H H
X: Don’t care
(13)
(15)
(11)
(1)
(3)
(2)
(6)
(5)
1Y
3A
SELECT
1B
1A
2B
2A
ST
3B
4A
4B
(10)
(14)
EN
G1
1
1 MUX
(9)
(4)
(7)
(12)
2Y
3Y
4Y
VCC
16
ST
4A
4B
4Y
3A
15
14
13
12
11
10
SELECT 1
2
3
4
5
6
7
1A
1B
1Y
2A
2B
2Y 3B
8GND 9 3Y
TC74LCX157F/FN/FT/FK
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System Diagram
Absolute Maximum Ratings (Note 1)
Characteristics Symbol Rating Unit
Power supply voltage VCC −0.5 to 7.0 V
DC input voltage VIN −0.5 to 7.0 V
−0.5 to 7.0 (Note 2)
DC output voltage VOUT −0.5 to VCC + 0.5
(Note 3)
V
Input diode current IIK −50 mA
Output diode current IOK ±50 (Note 4) mA
DC output current IOUT ±50 mA
Power dissipation PD 180 mW
DC VCC/ground current ICC/IGND ±100 mA
Storage temperature Tstg −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: VCC = 0 V
Note 3: High or low state. IOUT absolute maximum rating must be observed.
Note 4: VOUT < GND, VOUT > VCC
1A 2
4
7
9
12
1Y
2Y
3Y
4Y
1B 3
2A 5
2B 6
3A 11
3B 10
4A 14
4B 13
SELECT 1
15
ST
TC74LCX157F/FN/FT/FK
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Operating Ranges (Note 1)
Characteristics Symbol Rating Unit
1.65 to 3.6
Power supply voltage VCC 1.5 to 3.6 (Note 2)
V
Input voltage VIN 0 to 5.5 V
0 to 5.5 (Note 3)
Output voltage VOUT 0 to VCC (Note 4)
V
±24 (Note 5)
Output current IOH/IOL
±12 (Note 6)
mA
Operating temperature Topr −40 to 85 °C
Input rise and fall time dt/dv 0 to 10 (Note 7) ns/V
Note 1: The operating ranges must be maintained to ensure the normal operation of the device.
Unused inputs must be tied to either VCC or GND.
Note 2: Data retention only
Note 3: VCC = 0 V
Note 4: High or low state
Note 5: VCC = 3.0 to 3.6 V
Note 6: VCC = 2.7 to 3.0 V
Note 7: VIN = 0.8 to 2.0 V, VCC = 3.0 V
TC74LCX157F/FN/FT/FK
2010-01-31
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Electrical Characteristics
DC Characteristics (Ta = −40 to 85°C)
Characteristics Symbol Test Condition
VCC (V)
Min Max Unit
1.65 to 2.3 VCC×0.9 ⎯
2.3 to 2.7 1.7 ⎯
H-level VIH ⎯
2.7 to 3.6 2.0 ⎯
1.65 to 2.3 ⎯ V
CC×0.1
2.3 to 2.7 ⎯ 0.7
Input voltage
L-level VIL ⎯
2.7 to 3.6 ⎯ 0.8
V
IOH = −100 μA 1.65 to 3.6 VCC−0.2 ⎯
IOH = −4 mA 1.65 1.05 ⎯
IOH = −8 mA 2.3 1.7 ⎯
IOH = −12 mA 2.7 2.2 ⎯
IOH = −18 mA 3.0 2.4 ⎯
H-level VOH VIN = VIH or VIL
IOH = −24 mA 3.0 2.2 ⎯
IOL = 100 μA 1.65 to 3.6 ⎯ 0.2
IOL = 4 mA 1.65 ⎯ 0.45
IOL = 8 mA 2.3 ⎯ 0.7
IOL = 12 mA 2.7 ⎯ 0.4
IOL = 16 mA 3.0 ⎯ 0.4
Output voltage
L-level VOL V
IN = VIH or VIL
IOL = 24 mA 3.0 ⎯ 0.55
V
Input leakage current IIN VIN = 0 to 5.5 V 1.65 to 3.6 ⎯ ±5.0 μA
Power-off leakage current IOFF V
IN/VOUT = 5.5 V 0 ⎯ 10.0 μA
VIN = VCC or GND 1.65 to 3.6 ⎯ 10.0
Quiescent supply current ICC
VIN = 3.6 to 5.5 V 1.65 to 3.6 ⎯ ±10.0
Increase in Icc per input ΔICC V
IH = VCC − 0.6 V 2.7 to 3.6 ⎯ 500
μA
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AC Characteristics (Ta = −40 to 85°C)
Characteristics Symbol Test Condition
VCC (V)
Min Max Unit
1.8±0.15 ⎯ 20.0
2.5±0.2 ⎯ 7.3
2.7 ⎯ 6.3
Propagation delay time
(A, B-Y)
tpLH
tpHL
Figure 1, Figure 2
3.3 ± 0.3 1.5 5.8
ns
1.8±0.15 ⎯ 25.0
2.5±0.2 ⎯ 9.0
2.7 ⎯ 8.0
Propagation delay time
(SELECT-Y)
tpLH
tpHL Figure 1, Figure 2
3.3 ± 0.3 1.5 7.0
ns
1.8±0.15 ⎯ 25.0
2.5±0.2 ⎯ 9.0
2.7 ⎯ 8.0
Propagation delay time
(ST -Y)
tpLH
tpHL Figure 1, Figure 2
3.3 ± 0.3 1.5 7.0
ns
2.7 ⎯ ⎯
Output to output skew tosLH
tosHL (Note)
3.3 ± 0.3 ⎯ 1.0
ns
Note: Parameter guaranteed by design.
(tosLH = |tpLHm − tpLHn|, tosHL = |tpHLm − tpHLn|)
Dynamic Switching Characteristics
(Ta = 25°C, input: tr = tf = 2.5 ns, CL = 50 pF, RL = 500 Ω)
Characteristics Symbol Test Condition
VCC (V)
Typ. Unit
Quiet output maximum dynamic VOL VOLP V
IH = 3.3 V, VIL = 0 V 3.3 0.8 V
Quiet output minimum dynamic VOL |VOLV| VIH = 3.3 V, VIL = 0 V 3.3 0.8 V
Capacitive Characteristics (Ta = 25°C)
Characteristics Symbol Test Condition
VCC (V)
Typ. Unit
Input capacitance CIN ⎯ 3.3 7 pF
Output capacitance COUT ⎯ 0 8 pF
Power dissipation capacitance CPD f
IN = 10 MHz (Note) 3.3 25 pF
Note: CPD is defined as the value of the internal equivalent capacitance which is calculated from the operating
current consumption without load.
Average operating current can be obtained by the equation:
I
CC (opr) = CPD･VCC･fIN + ICC
TC74LCX157F/FN/FT/FK
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AC Test Circuit
AC Waveform
VCC
Symbol 3.3 ± 0.3 V
2.7V 2.5 ± 0.2 V 1.8 ± 0.15 V
VIH 2.7V VCC V
CC
VIM 1.5V VCC/2 VCC/2
Input
tr,tf 2.5ns 2.0ns 2.0ns
Output VOM 1.5V VOH/2 VOH/2
CL 50pF 30pF 30pF Load
RL 500Ω 500Ω 1kΩ
Figure 2 tpLH, tpHL
90%
10%
Non-Inverting
Output
Input
VOL
VOH
GND
VIH
VOM
tpLH t
pHL
tr t
f
VIM
Inverting
Output
VOL
VOH
VOM
tpHL t
pLH
Output Measure
RL
CL
Figure 1
TC74LCX157F/FN/FT/FK
2010-01-31
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Package Dimensions
Weight: 0.18 g (typ.)
TC74LCX157F/FN/FT/FK
2010-01-31
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Package Dimensions (Note)
Note: This package is not available in japan.
Weight: 0.12 g (typ.)
TC74LCX157F/FN/FT/FK
2010-01-31
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Package Dimensions
Weight: 0.06 g (typ.)
TC74LCX157F/FN/FT/FK
2010-01-31
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Package Dimensions
Weight: 0.02 g (typ.)
TC74LCX157F/FN/FT/FK
2010-01-31
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