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CD74HCT251 データシート(PDF) 1 Page - Texas Instruments

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部品番号 CD74HCT251
部品情報  High-Speed CMOS Logic 8-Input Multiplexer, Three-State
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ホームページ  http://www.ti.com
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CD74HCT251 データシート(HTML) 1 Page - Texas Instruments

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Data sheet acquired from Harris Semiconductor
SCHS169C
Features
• Selects One of Eight Binary Data Inputs
• Three-State Output Capability
• True and Complement Outputs
• Typical (Data to Output) Propagation Delay of 14ns at
VCC = 5V, CL = 15pF, TA = 25
oC
• Fanout (Over Temperature Range)
- Standard Outputs . . . . . . . . . . . . . . . 10 LSTTL Loads
- Bus Driver Outputs . . . . . . . . . . . . . 15 LSTTL Loads
• Wide Operating Temperature Range . . . -55oC to 125oC
• Balanced Propagation Delay and Transition Times
• Significant Power Reduction Compared to LSTTL
Logic ICs
• Alternate Source is Philips
• HC Types
- 2V to 6V Operation
- High Noise Immunity: NIL = 30%, NIH = 30% of VCC
at VCC = 5V
• HCT Types
- 4.5V to 5.5V Operation
- Direct LSTTL Input Logic Compatibility,
VIL= 0.8V (Max), VIH = 2V (Min)
- CMOS Input Compatibility, Il ≤ 1µA at VOL, VOH
Pinout
CD54HC251, CD54HCT251
(CERDIP)
CD74HC251, CD74HCT251
(PDIP, SOIC)
TOP VIEW
Description
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.
14
15
16
9
13
12
11
10
1
2
3
4
5
7
6
8
I3
I2
I1
I0
Y
Y
GND
OE
VCC
I5
I6
I7
S0
S1
S2
I4
Ordering Information
PART NUMBER
TEMP. RANGE
(oC)
PACKAGE
CD54HC251F3A
-55 to 125
16 Ld CERDIP
CD54HCT251F3A
-55 to 125
16 Ld CERDIP
CD74HC251E
-55 to 125
16 Ld PDIP
CD74HC251M
-55 to 125
16 Ld SOIC
CD74HC251MT
-55 to 125
16 Ld SOIC
CD74HC251M96
-55 to 125
16 Ld SOIC
CD74HCT251E
-55 to 125
16 Ld PDIP
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.
November 1997 - Revised October 2003
CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper IC Handling Procedures.
Copyright
© 2003, Texas Instruments Incorporated
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-


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