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STMicroelectronics Electronic Components Datasheet

M74HC299 Datasheet

8-BIT PIPO SHIFT REGISTER

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M74HC299 pdf
M54/74HC299
M54/74HC323
HC299 8 BIT PIPO SHIFT REGISTER WITHASYNCHRONOUS CLEAR
HC323 8 BIT PIPO SHIFT REGISTER WITH SYNCHRONOUS CLEAR
. HIGH SPEED
fMAX = 42 MHz (TYP.) AT VCC = 5V
. LOW POWER DISSIPATION
ICC = 4 µA (MAX.) AT TA = 25 °C
. HIGH NOISE IMMUNITY
VNIH = VNIL = 28 % VCC (MIN.)
. OUTPUT DRIVE CAPABILITY
. 10 LSTTL LOADS FOR QA’ TO QH’
15 LSTTL LOADS FOR QA TO QH
SYMMETRICAL OUTPUT IMPEDANCE
IOH= IOL = 6 mA (MIN.) FOR QA, TO QH,
IOH= IOL = 4 mA (MIN.) FOR QA, TO QH
. BALANCED PROPAGATION DELAYS
tPLH = tPHL
. WIDE OPERATING VOLTAGE RANGE
VCC (OPR) = 2 V TO 6 V
. PIN AND FUNCTION COMPATIBLE
WITH 54/74LS299
B1R
(Plastic Package)
F1R
(Ceramic Package)
M 1R
(Micro Package)
C1R
(Chip Carrier)
ORDER CODES :
M54HCXXXF1R M74HCXXXM1R
M74HCXXXB1R M74HCXXXC1R
PIN CONNECTIONS (top view)
DESCRIPTION
The M54/74HC299/323 are high speed CMOS 8-
BIT PIPO SHIFT REGISTERS (3-STATE) fabri-
cated with silicon gate C2MOS technology.
They achieve the high speed operation similar to
equivalent LSTTL while maintaining the CMOS low
power consumption.
These devices have four modes (HOLD, SHIFT
LEFT, SHIFT RIGHT and LOAD DATA). Each mode
is chosen by two function select inputs (S0, S1).
When one or both enable inputs, (G1, G2) are high,
the eight input/output terminals are in the high-
impedance state ; however sequential operation or
clearing of the register is not affected.
Clear function on the HC299 is asynchronous to
CLOCK, while the HC323 is cleared synchronous to
clock.
All inputs are equipped with protection circuits
against static discharge and transient excess volt-
age.
October 1993
NC =
No Internal
Connection
1/15


STMicroelectronics Electronic Components Datasheet

M74HC299 Datasheet

8-BIT PIPO SHIFT REGISTER

No Preview Available !

M74HC299 pdf
M54/M74HC299/323
INPUT AND OUTPUT EQUIVALENT CIRCUIT
TRUTH TABLE
INPUTS
INPUTS/OUTPUTS
OUTPUTS
MODE
FUNCTION
CLEAR SELECTED
OUTPUT
CONTROL
CLOCK
SERIAL
A/QA H/QH QA’ QH’
S1 S0 G1 * G2 * (299) (323) SL SR
Z L HHXX X XXZZ L L
CLEAR
L
L
LXLLX
XL LLX
XXL L LL
XXL L LL
HOLD
H
LLLL
X
X X QA0 QH0 QA0 QH0
SHIFT
RIGHT
H
H
LHLL
LHLL
X H H QGn H QGn
X L L QGn L QGn
SHIFT
LEFT
H
H
HL L L
HL L L
H X QBn H QBn H
L X QBn L QBn L
LOAD
H
HHXX
XXa h ah
* When one or both output controls are high, the eight, input/output terminals are in thehigh impedance state: however sequential operation or clearing
of the register is not affected.
Z : HIGH IMPEDANCE
Qn0 : THE LEVEL OF An BEFORE THE INDICATED STEADY STATE INPUT CONDITIONS WERE ESTABLISHED.
Qnn : THE LEVEL ON Qn BEFORE THE MOST RECENT ACTIVE TRANSITION INDICATED BY
OR
a, h : THE LEVEL OF THE STEADY STATE INPUTS A, H, RESPECTIVELY.
X : DON’T CARE
2/15


Part Number M74HC299
Description 8-BIT PIPO SHIFT REGISTER
Maker ST Microelectronics
Total Page 15 Pages
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