• Significant Power Reduction Compared to LSTTL
Logic ICs
• HC Types
- 2V to 6V Operation
- High Noise Immunity: N
= 30%, NIH = 30% of V
IL
at VCC = 5V
• HCT Types
- 4.5V to 5.5V Operation
- Direct LSTTL Input Logic Compatibility,
V
= 0.8V (Max), VIH = 2V (Min)
IL
- CMOS Input Compatibility, I
≤ 1µA at VOL, V
l
OH
Pinout
CD74HC299, CD74HCT299
(PDIP, SOIC)
TOP VIEW
S0
OE1
OE2
I/O
I/O
I/O
I/O
Q0
MR
GND
1
2
3
4
6
5
4
6
2
7
0
8
9
10
V
20
CC
S1
19
DS7
18
Q7
17
I/O
16
7
I/O
15
5
I/O
14
3
I/O
13
1
12
CP
DS0
11
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/O
- I/O7) respond only
0
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 (
When
MR output is low, the register is cleared regardless of
MR) is an asynchronous active low input.
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:
CC
1. Both output enable (
OE1andOE2)inputs are lowandS0
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 terminalsare in the
high impedance state butbeing input ports, readyforparallel 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.
Ordering Information
PART NUMBER TEMP. RANGE (oC) PACKAGE
CD74HC299E-55 to 12520 Ld PDIPE20.3
CD74HCT299E-55 to 12520 Ld PDIPE20.3
CD74HC299M-55 to 12520 Ld SOICM20.3
CD74HCT299M-55 to 12520 Ld SOICM20.3
NOTES:
1. When ordering, use the entire partnumber. 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.
PKG.
NO.
CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper IC Handling Procedures.
Copyright
NOTE: H = Input Voltage High Level, h = Input voltage high one set-up timer prior clock transition; L = Input Voltage Low Level; l = Input
voltage low one set-up time prior clock transition; qn = Lower case letter indicates the state of the reference output one set-up time prior to
clock transition; X - Voltage level on logic status don’t care; Z = Output in high impedance state, ↑ = Low to High Clock Transition.
CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation
of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied.
NOTE:
3. θJA is measured with the component mounted on an evaluation PC board in free air.
NOTE: Outputs should be switching from 10% VCC to 90% VCC in
accordance with device truth table. Forf
, input duty cycle = 50%.
MAX
FIGURE 1. HC CLOCK PULSE RISE AND FALL TIMES AND
PULSE WIDTH
fC
50%
I
L
V
CC
GND
1.3V
I
fC
L
3V
GND
t
rCL
CLOCK
= 6ns
0.3V
2.7V
1.3V
0.3V
t
fCL
t
WL
= 6ns
1.3V
t
WH
t
WL
+ tWH=
NOTE: Outputs should be switching from 10% VCC to 90% VCC in
accordance with device truth table. Forf
, input duty cycle = 50%.
MAX
FIGURE 2. HCT CLOCK PULSE RISE AND FALL TIMES AND
PULSE WIDTH
7
CD74HC299, CD74HCT299
Test Circuits and Waveforms
(Continued)
tr = 6nstf = 6ns
V
t
CC
GND
TLH
INPUT
t
90%
50%
10%
THL
90%
t
50%
10%
PLH
INVERTING
OUTPUT
t
PHL
FIGURE 3. HC TRANSITION TIMES AND PROPAGATION
DELAY TIMES, COMBINATION LOGIC
tfC
L
50%
t
H(L)
t
SU(L)
CLOCK
INPUT
DAT A
INPUT
t
SU(H)
trC
L
90%
10%
t
H(H)
V
CC
GND
V
CC
50%
GND
= 6ns
tr = 6ns
INPUT
t
2.7V
1.3V
0.3V
THL
t
f
3V
GND
t
TLH
90%
t
PLH
1.3V
10%
INVERTING
OUTPUT
t
PHL
FIGURE 4. HCT TRANSITION TIMES AND PROPAGATION
DELAY TIMES, COMBINATION LOGIC
CLOCK
INPUT
DAT A
INPUT
t
SU(H)
trC
L
2.7V
0.3V
t
H(H)
1.3V
1.3V
tfC
L
1.3V
t
H(L)
1.3V
t
SU(L)
3V
GND
3V
GND
OUTPUT
t
REM
V
CC
SET, RESET
OR PRESET
50%
90%
t
PLH
IC
t
TLH
t
THL
90%
50%
10%
t
PHL
GND
C
L
50pF
FIGURE 5. HC SETUP TIMES, HOLD TIMES, REMOVAL TIME,
AND PROPAGATION DELAY TIMES FOR EDGE
TRIGGERED SEQUENTIAL LOGIC CIRCUITS
OUTPUT
t
REM
3V
SET, RESET
OR PRESET
1.3V
90%
1.3V
t
IC
t
PLH
TLH
t
THL
90%
1.3V
10%
t
PHL
GND
C
L
50pF
FIGURE 6. HCT SETUP TIMES, HOLD TIMES, REMOVAL TIME,
AND PROPAGATION DELAY TIMES FOR EDGE
TRIGGERED SEQUENTIAL LOGIC CIRCUITS
8
CD74HC299, CD74HCT299
Test Circuits and Waveforms
6ns6ns
OUTPUT
DISABLE
OUTPUT LOW
TO OFF
OUTPUT HIGH
TO OFF
50%
t
t
OUTPUTS
ENABLED
PLZ
PHZ
90%
10%
90%
OUTPUTS
DISABLED
(Continued)
10%
t
PZL
t
PZH
FIGURE 7. HC THREE-STATE PROPAGATION DELAY
WAVEFORM
OTHER
INPUTS
TIED HIGH
OR LOW
OUTPUT
DISABLE
50%
50%
OUTPUTS
ENABLED
IC WITH
THREE-
STATE
OUTPUT
V
CC
GND
R
OUTPUT
0.3
t
t
6ns
PZL
PZH
t
r
OUTPUT
DISABLE
OUTPUT LOW
TO OFF
OUTPUT HIGH
TO OFF
t
t
OUTPUTS
ENABLED
6nst
PLZ
PHZ
10%
90%
f
2.7
1.3
OUTPUTS
DISABLED
FIGURE 8. HCT THREE-STATE PROPAGATION DELAY
WAVEFORM
= 1kΩ
L
C
L
50pF
VCC FOR t
GND FOR t
PLZ
PHZ
AND t
AND t
PZL
PZH
3V
GND
1.3V
1.3V
OUTPUTS
ENABLED
NOTE: Open drain waveforms t
VCC, CL = 50pF.
FIGURE 9. HC AND HCT THREE-STATE PROPAGATION DELAY TEST CIRCUIT
PLZ
and t
are the same as those for three-state shown on the left. The test circuit is Output RL=1kΩto
PZL
9
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Copyright 1999, Texas Instruments Incorporated
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