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CD74HC646M96 Datenblatt(PDF) 1 Page - Texas Instruments

Teilenummer CD74HC646M96
Bauteilbeschribung  High-Speed CMOS Logic Octal Bus Transceiver/Register, Three-State
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Hersteller  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

CD74HC646M96 Datenblatt(HTML) 1 Page - Texas Instruments

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Data sheet acquired from Harris Semiconductor
SCHS193A
Features
• Independent Registers for A and B Buses
• Non-Inverting
• Three-State Outputs
• Drives 15 LSTTL Loads
• Typical Propagation Delay = 12ns (A to B, B to A) 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
• HC Types
- 2V to 6V Operation
- High Noise Immunity: NIL = 30%, NIH = 30% of VCC
at VCC = 5V
Pinout
CD74HC646
(SOIC)
TOP VIEW
Description
The CD74HC646 is an octal bus transceiver/register with
three-state non-inverting outputs. This device is a bus
transceiver with D-type flip-flops which act as internal storage
registers. Data on the A bus or the B bus can be clocked into
the registers on the Low-to-High transition of either CAB or
CBA clock inputs. Outputs enable (OE) and direction (DIR)
inputs control the transceiver functions. Data present at the
high impedance output can be stored in either register or both
but only one of the two buses can be enabled as outputs at
any one time. The select controls (SAB and SBA) can
multiplex stored and transparent (real time) data. The
direction control determines which data bus will receive data
when the output enable (OE) is Low. In the high impedance
mode (output enable High), A data can be stored in one
register and B data can be stored in the other register. The
clocks are not gated with the direction (DIR) and output
enable (OE) terminals; data at the A or B terminals can be
clocked into the storage flip-flops at any time.
1
2
3
4
5
6
7
8
9
10
11
12
CAB
SAB
DIR
A0
A1
A2
A3
A4
A5
A6
A7
GND
16
17
18
19
20
21
22
23
24
15
14
13
VCC
SBA
OE
B0
B1
B3
B5
B6
B7
CBA
B2
B4
Ordering Information
PART NUMBER
TEMP.
RANGE (oC)
PACKAGE
CD74HC646M
-55 to 125
24 Ld SOIC
CD74HC646M96
-55 to 125
24 Ld SOIC
NOTE: When ordering, use the entire part number. The suffix 96
denotes tape and reel.
January 1998 - Revised May 2003
CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper IC Handling Procedures.
Copyright
© 2003, Texas Instruments Incorporated
CD74HC646
High-Speed CMOS Logic
Octal Bus Transceiver/Register, Three-State
NOT
RECOMMENDED
FOR
NEW
DESIGNS


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