Texas Instruments CD74HCT299M Manual


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Side 1/20
1
Data sheet acquired from Harris Semiconductor
SCHS178C
Features
Buered Inputs
Four Operating Modes: Shift Left, Shift Right, Load
and Store
Can be Cascaded for N-Bit Word Lengths
I/O0 - I/O7 Bus Drive Capability and Three-State for
Bus Oriented Applications
Typical fMAX = 50MHz at VCC = 5V, CL = 15pF, TA= 25oC
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
HCT Types
- 4.5V to 5.5V Operation
- Direct LSTTL Input Logic Compatibility,
VIL= 0.8V (Max), VIH = 2V (Min)
- CMOS Input Compatibility, Il µ1 A at VOL, VOH
Pinout
CD54HC299, CD54HCT299
(CERDIP)
CD74HC299, CD74HCT299
(PDIP, SOIC)
TOP VIEW
Description
The ’HC259 and ’HCT299 are 8-bit shift/storage registers
with three-state bus interface capability. The register has four
synchronous-operating modes controlled by the two select
inputs as shown in the mode select (S0, S1) table. The mode
select, the serial data (DS0, DS7) and the parallel data (I/O
0
- I/O7 ) respond only to the low-to-high transition of the clock
(CP) pulse. S0, S1 and data inputs must be stable one set-
up time prior to the clock positive transition.
The Master Reset ( MR) is an asynchronous active low input.
When MR output is low, the register is cleared regardless of
the status of all other inputs. The register can be expanded
by cascading same units by tying the serial output (Q0) to
the serial data (DS7) input of the preceding register, and
tying the serial output (Q7) to the serial data (DS0) input of
the following register. Recirculating the (n x 8) bits is
accomplished by tying the Q7 of the last stage to the DS0 of
the first stage.
The three-state input/output I(/O) port has three modes of
operation:
1. Both output enable ( OE1 and OE2) inputs are low and S0
or S1 or both are low, the data in the register is presented
at the eight outputs.
2. When both S0 and S1 are high, I/O terminals are in the
high impedance state but being input ports, ready for par-
allel data to be loaded into eight registers with one clock
transition regardless of the status of OE1 and OE2.
3. Either one of the two output enable inputs being high will
force I/O terminals to be in the o-state. It is noted that
each I/O terminal is a three-state output and a CMOS
buer input.
11
12
13
14
15
16
17
18
20
19
10
9
8
7
6
5
4
3
2
1S0
OE1
OE2
I/O6
I/O4
I/O2
Q0
I/O0
MR
GND
VCC
DS7
Q7
I/O
7
S1
I/O
5
I/O
3
I/O
1
CP
DS0
Ordering Information
PART NUMBER TEMP. RANGE (o C) PACKAGE
CD54HC299F3A -55 to 125 20 Ld CERDIP
CD54HCT299F3A -55 to 125 20 Ld CERDIP
CD74HC299E -55 to 125 20 Ld PDIP
CD74HC299M -55 to 125 20 Ld SOIC
CD74HC299M96 -55 to 125 20 Ld SOIC
CD74HCT299E -55 to 125 20 Ld PDIP
CD74HCT299M -55 to 125 20 Ld SOIC
CD74HCT299M96 -55 to 125 20 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
CD54HC299, CD74HC299,
CD54HCT299, CD74HCT299
High-Speed CMOS Logic
8-Bit Universal Shift Register; Three-State
[ /Title
(CD74
HC299
,
CD74
HCT29
9)
/Sub-
ject
(High
Speed
CMOS
Logic
8-Bit
Uni-
versal
Shift


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Model: CD74HCT299M

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