CD4508BMS
CMOS Dual 4-Bit Latch
December 1992
Features
Pinout
CD4508BMS
TOP VIEW
• High-Voltage Types (20-Volt Rating)
• Two Independent 4-Bit Latches
• Individual Master Reset for Each 4-Bit Latch
1
2
3
4
5
6
7
8
9
24
VDD
RESET A
23 Q3B
STROBE A
• 3-State Outputs with High-Impedance State for Bus
Line Applications
22 D3B
OUTPUT DISABLE A
21 Q2B
D0A
Q0A
D1A
Q1A
• Medium-Speed Operation: tPHL = tPLH = 70nS (Typ.)
at VDD = 10V and CL = 50pF
20 D2B
19 Q1B
• 100% Tested for Quiescent Current at 20V
• 5V, 10V, and 15V Parametric Ratings
18 D1B
17 Q0B
D2A
Q2A
16 D0B
• Standardized, Symmetrical Output Characteristics
D3A 10
Q3A 11
VSS 12
15 OUTPUT DISABLE B
14 STROBE B
13 RESET B
• Maximum Input Current of 1µA at 18V Over Full Pack-
age Temperature Range; 100nA at 18V and 25oC
• Noise Margin (Full Package-Temperature Range):
- 1V at VDD = 5V
- 2V at VDD = 10V
- 2.5V at VDD = 15V
Functional Diagram
• Meets all Requirements of JEDEC Tentative Standard
No. 13B, "Standard Specifications for Description of
‘B’ Series CMOS Devices"
OUTPUT
DISABLE
D0A
Q0A
D1A
Q1A
Applications
4-BIT
LATCH
3-STATE
OUTUTS
Q2A
D2A
D3A
• Buffer Storage
Q3A
• Holding Registers
• Data Storage and Multiplexing
STROBE
RESET
OUTPUT
DISABLE
Description
D0B
D1B
Q0B
CD4508BMS dual 4-bit latch contains two identical 4-bit
latches with separate STROBE, RESET, and OUTPUT
DISABLE controls. With the STROBE line in the high state,
the data on the "D" inputs appear at the corresponding "Q"
outputs provided the DISABLE line is in the low state.
Changing the STROBE line to the low state locks the data
into the latch. A high on the reset line forces the outputs to a
low level regardless of the state of the STROBE input. The
outputs are forced to the high-impedance state for bus line
applications by a high level on the DISABLE input.
Q1B
4-BIT
LATCH
3-STATE
OUTUTS
Q2B
D2B
Q3B
D3B
STROBE
RESET
The CD4508BMS is supplied in these 24 lead outline
packages:
Braze Seal DIP
Frit Seal DIP
H4V
H1Z
Ceramic Flatpack H4P
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
File Number 3337
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7-1148