CD74HC195 Datasheet, PDF (1/6 Pages) Texas Instruments – High Speed CMOS Logic 4-Bit Parallel Access Register

CD74HC195
Data sheet acquired from Harris Semiconductor
SCHS165
September 1997
High Speed CMOS Logic
4-Bit Parallel Access Register
[ /Title
(CD74
HC195
)
/Sub-
ject
(High
Speed
CMOS
Logic
4-Bit
Paral-
lel
Access
Regis-
ter)
/Autho
Features
Description
• Asynchronous Master Reset
• J, K, (D) Inputs to First Stage
• Fully Synchronous Serial or Parallel Data Transfer
• Shift Right and Parallel Load Capability
• Complementary Output From Last Stage
• Buffered Inputs
• _CTyLp=ic1a5l _pfMF,ATXA==5205M_oHCz at V_CC = 5V,
• Fanout (Over Temperature Range)
- Standard Outputs . . . . . . . . . . . . . . . 10 LSTTL Loads
- Bus Driver Outputs . . . . . . . . . . . . . 15 LSTTL Loads
• Wide Operating Temperature Range . . . -55^oC to 125^oC
• Balanced Propagation Delay and Transition Times
• Significant Power Reduction Compared to LSTTL
Logic ICs
• HC Types
- 2V to 6V Operation
- High Noise Immunity: N_IL = 30%, N_IH = 30%of V_CC at
V_CC = 5V
PInout
CD74HC195
(PDIP, SOIC)
TOP VIEW
MR 1
J2
K3
D0 4
D1 5
D2 6
D3 7
GND 8
16 V_CC
15 Q₀
14 Q₁
13 Q₂
12 Q₃
11 Q₃
10 CP
9 PE
The device is useful in a wide variety of shifting, counting
and storage applications. It performs serial, parallel, serial to
parallel, or parallel to serial data transfers at very high
speeds.
The two modes of operation, shift right (Q₀-Q₁) and parallel
load, are controlled by the state of the Parallel Enable (PE)
input. Serial data enters the first flip-flop (Q₀) via the J and K
inputs when the PE input is high, and is shifted one bit in the
direction Q₀-Q₁-Q₂-Q₃ following each Low to High clock
transition. The J and K inputs provide the flexibility of the JK-
type input for special applications and by tying the two pins
together, the simple D-type input for general applications.
The device appears as four common-clocked D flip-flops
when the PE input is Low. After the Low to High clock transi-
tion, data on the parallel inputs (D0-D3) is transferred to the
respective Q₀-Q₃ outputs. Shift left operation (Q₃-Q₂) can
be achieved by tying the Q_n outputs to the Dn-1 inputs and
holding the PE input low.
All parallel and serial data transfers are synchronous, occurring
after each Low to High clock transition. The CD74HC195 series
utilizes edge triggering; therefore, there is no restriction on the
activity of the J, K, Pn and PE inputs for logic operations, other
than set-up and hold time requirements. A Low on the
asynchronous Master Reset (MR) input sets all Q outputs Low,
independent of any other input condition.
Ordering Information
PART NUMBER TEMP. RANGE (^oC) PACKAGE
PKG.
NO.
CD74HC195E
-55 to 125
16 Ld PDIP E16.3
CD74HC195M
-55 to 125
16 Ld SOIC M16.15
NOTES:
1. When ordering, use the entire part number.
2. 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.
CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper IC Handling Procedures.
Copyright © Harris Corporation 1997
1
File Number 1482.1