CD54HC251_14 Datasheet, PDF (1/16 Pages) Texas Instruments – High-Speed CMOS Logic 8-Input Multiplexer, Three-State

Data sheet acquired from Harris Semiconductor
SCHS169C
November 1997 - Revised October 2003
CD54HC251, CD74HC251,
CD54HCT251, CD74HCT251
High-Speed CMOS Logic
8-Input Multiplexer, Three-State
[ /Title
(CD74
HC251
,
CD74
HCT25
1)
/Sub-
ject
(High
Speed
CMOS
Logic
8-Input
Multi-
plexer;
Three-
Features
Description
• Selects One of Eight Binary Data Inputs
• Three-State Output Capability
• True and Complement Outputs
• Typical (Data to Output) Propagation Delay of 14ns at
V_CC = 5V, C_L = 15pF, T_A = 25^oC
• Fanout (Over Temperature Range)
- Standard Outputs . . . . . . . . . . . . . . . 10 LSTTL Loads
- Bus Driver Outputs . . . . . . . . . . . . . 15 LSTTL Loads
• Wide Operating Temperature Range . . . -55^oC to 125^oC
• Balanced Propagation Delay and Transition Times
• Significant Power Reduction Compared to LSTTL
Logic ICs
• Alternate Source is Philips
The ’HC251 and ’HCT251 are 8-channel digital multiplexers
with three-state outputs, fabricated with high-speed silicon-
gate CMOS technology. Together with the low power
consumption of standard CMOS integrated circuits, they
possess the ability to drive 10 LSTTL loads. The three-state
feature makes them ideally suited for interfacing with bus
lines in a bus-oriented system.
This multiplexer features both true (Y) and complement (Y)
outputs as well as an output enable (OE) input. The OE must
be at a low logic level to enable this device. When the OE
input is high, both outputs are in the high-impedance state.
When enabled, address information on the data select inputs
determines which data input is routed to the Y and Y
outputs. The ’HCT251 logic family is speed, function, and
pin-compatible with the standard ’LS251.
Ordering Information
• HC Types
- 2V to 6V Operation
- High Noise Immunity: N_IL = 30%, N_IH = 30% of V_CC
at V_CC = 5V
• HCT Types
- 4.5V to 5.5V Operation
- Direct LSTTL Input Logic Compatibility,
V_IL= 0.8V (Max), V_IH = 2V (Min)
- CMOS Input Compatibility, I_l ≤ 1µA at V_OL, V_OH
PART NUMBER
CD54HC251F3A
CD54HCT251F3A
CD74HC251E
CD74HC251M
CD74HC251MT
CD74HC251M96
TEMP. RANGE
(^oC)
-55 to 125
-55 to 125
-55 to 125
-55 to 125
-55 to 125
-55 to 125
PACKAGE
16 Ld CERDIP
16 Ld CERDIP
16 Ld PDIP
16 Ld SOIC
16 Ld SOIC
16 Ld SOIC
Pinout
CD74HCT251E
-55 to 125
16 Ld PDIP
CD54HC251, CD54HCT251
(CERDIP)
CD74HC251, CD74HCT251
(PDIP, SOIC)
TOP VIEW
I₃ 1
I₂ 2
I₁ 3
I₀ 4
Y5
Y6
OE 7
GND 8
16 V_CC
15 I₄
14 I₅
13 I₆
12 I₇
11 S0
10 S1
9 S2
CD74HCT251M
-55 to 125
16 Ld SOIC
CD74HCT251MT
-55 to 125
16 Ld SOIC
CD74HCT251M96
-55 to 125
16 Ld SOIC
NOTE: When ordering, use the entire part number. The suffix 96
denotes tape and reel. The suffix T denotes a small-quantity reel of
250.
CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper IC Handling Procedures.
Copyright © 2003, Texas Instruments Incorporated
1