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CD74HC299 Datasheet(PDF) 1 Page - Texas Instruments

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Part # CD74HC299
Description  High Speed CMOS Logic 8-Bit Universal Shift Register; Three-State
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

CD74HC299 Datasheet(HTML) 1 Page - Texas Instruments

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Data sheet acquired from Harris Semiconductor
SCHS178
Features
• Buffered 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 =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
• 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
CD74HC299, CD74HCT299
(PDIP, SOIC)
TOP VIEW
Description
The Harris CD74HC259 and CD74HCT299 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/O0 - I/O7) respond only
to the low-to-high transition of the clock (CP) pulse. S0, S1
and data inputs must be 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 off-state. It is noted that
each I/O terminal is a three-state output and a CMOS
buffer input.
11
12
13
14
15
16
17
18
20
19
10
9
8
7
6
5
4
3
2
1
S0
OE1
OE2
I/O6
I/O4
I/O2
Q0
I/O0
MR
GND
VCC
DS7
Q7
I/O7
S1
I/O5
I/O3
I/O1
CP
DS0
Ordering Information
PART NUMBER
TEMP. RANGE (oC)
PACKAGE
PKG.
NO.
CD74HC299E
-55 to 125
20 Ld PDIP
E20.3
CD74HCT299E
-55 to 125
20 Ld PDIP
E20.3
CD74HC299M
-55 to 125
20 Ld SOIC
M20.3
CD74HCT299M
-55 to 125
20 Ld SOIC
M20.3
NOTES:
1. When ordering, use the entire part number. Add the suffix 96 to
obtain the variant in the tape and reel.
2. Wafer and die for this part number is available which meets all
electrical specifications. Please contact your local sales office or
Harris customer service for ordering information.
January 1998
CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper IC Handling Procedures.
Copyright
© Harris Corporation 1998
File Number
1485.1
CD74HC299,
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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