74VHC157 Quad 2-Input Multiplexer
November 1992
Revised April 1999
74VHC157
Quad 2-Input Multiplexer
General Description
The VHC157 is an advanced high speed CMOS Quad 2-
Channel Multiplexer fabricated with silicon gate CMOS
technology. It achieves the high speed operation similar to
equivalent Bipolar Schottky TTL while maintaining the
CMOS low power dissipation.
It consists of four 2-input digital multiplexers with common
select and enable inputs. When the ENABLE input is held
鈥淗鈥?level, selection of data is inhibited and all the outputs
become 鈥淟鈥?level. The SELECT decoding determines
whether the I
0x
or I
1x
inputs get routed to their correspond-
ing outputs.
An Input protection circuit ensures that 0V to 7V can be
applied to the input pins without regard to the supply volt-
age. This device can be used to interface 5V to 3V systems
and on two supply systems such as battery back up. This
circuit prevents device destruction due to mismatched sup-
ply and input voltages.
Features
s
High Speed: t
PD
=
4.1 ns (typ) at V
CC
=
5V
s
Low power dissipation: I
CC
=
4
碌A(chǔ)
(max.) at T
A
=
25擄C
s
High noise immunity: V
NIH
=
V
NIL
=
28% V
CC
(min.)
s
Power down protection is provided on all inputs
s
Low noise: V
OLP
=
0.8V (max.)
s
Pin and function compatible with 74HC157
Ordering Code:
Order Number
74VHC157M
74VHC157SJ
74VHC157MTC
74VHC157N
Package Number
M16A
M16D
MTC16
N16E
Package Description
16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150鈥?Narrow
16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
16-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300鈥?Wide
Surface mount packages are also available on Tape and Reel. Specify by appending the suffix letter 鈥淴鈥?to the ordering code.
Logic Symbols
Connection Diagram
IEEE/IEC
Pin Descriptions
Pin Names
I
0a
鈥揑
0d
I
1a
鈥揑
1d
E
S
Z
a
鈥揨
d
Description
Source 0 Data Inputs
Source 1 Data Inputs
Enable Input
Select Input
Outputs
漏 1999 Fairchild Semiconductor Corporation
DS011536.prf
www.fairchildsemi.com
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