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74VHC299 Datasheet PDF

74VHC299
National Semiconductor

Part Number 74VHC299
Description 8-Input Universal Shift/Storage Register
Page 10 Pages
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PRELIMINARY
November 1995
74VHC299
8-Input Universal Shift Storage
Register with Common Parallel I O Pins
General Description
The VHC299 is an advanced high speed CMOS device fab-
ricated with silicon gate CMOS technology It achieves the
high-speed operation similar to equivalent Bipolar Schottky
TTL while maintaining the CMOS low power dissipation
The VHC299 is an 8-bit universal shift storage register with
TRI-STATE outputs Four modes of operation are possi-
ble hold (store) shift left shift right and load data The par-
allel load inputs and flip-flop outputs are multiplexed to re-
duce the total number of package pins Additional outputs
are provided for flip-flops Q0 Q7 to allow easy serial cas-
cading A separate active LOW Master Reset is used to
reset the register
An input protection circuit insures that 0V to 7V can be ap-
plied to the input pins without regard to the supply voltage
This device can be used to interface 5V to 3V systems and
two supply systems such as battery backup This circuit pre-
vents device destruction due to mismatched supply and in-
put voltages
Features
Y Low power dissipation
ICC e 4 mA at TA e 25 C
Y High noise immunity
VNIH e VNIL e 28% VCC (min)
Y All inputs are equipped with a power down protection
function
Y Balanced propagation delays tPLH j tPHL
Y Low noise VOLP e 0 9V (typ)
Y Pin and function compatible with 74HC299
Commercial
74VHC299M
74VHC299SJ
74VHC299MTC
74VHC299N
Package
Number
M20B
M20D
MTC20
N20A
Package Description
20-Lead Molded JEDEC SOIC
20-Lead Molded EIAJ SOIC
20-Lead Molded JEDEC Type 1 TSSOP
20-Lead Molded DIP
Note Surface mount packages are also available on Tape and Reel
Specify by appending the suffix letter ‘X’ to the ordering code
Logic Symbols
Connection Diagram
IEEE IEC
Pin Assignment for
DIP TSSOP and SOIC
TL F 11638–1
TRI-STATE is a registered trademark of National Semiconductor Corporation
C1995 National Semiconductor Corporation TL F 11638
TL F 11638 – 3
TL F 11638 – 2
RRD-B30M125 Printed in U S A

















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74VHC299 8-Input Universal Shift/Storage Register 74VHC299
National Semiconductor
74VHC299 pdf



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