CD40108-4×4-bit synchronous triple-port register

CD40108 belongs to 4000 Series CMOS Logic Family of Integrated Circuits (IC’s) constructed with N- and P-channel enhancement mode transistors. CD40108 has 4×4-bit synchronous triple-port register

CD40108 has a supply voltage range of 5V to 20V, which is much higher than any contemporary logic family. It has buffered output which improves transfer characteristics by providing very high gain. All inputs are protected against static discharge with diodes to VDD and VSS.

CD40108 Features

• High Voltage Type (20V Rating)
• Four 4-Bit Registers
• One Input and Two Output Buses
• Unlimited Expansion in Bit and Word Directions
• Data Lines have latched Inputs
• 3-State Outputs
• Standard Symmetrical Output Characteristics
• 100% Tested for Maximum Quiescent Current at 20V
• 5V, 10V, and 15V Parametric Ratings
• Maximum Input Current of 1μA at 18V Over Full Package Temperature Range; 100nA at 18V and +25oC
• Noise Margin (Over Full Package Temperature Range):
  • 1V at VDD = 5V
  • 2V at VDD = 10V
  • 2.5V at VDD = 15V

CD40108 Specifications

Absolute Maximum Ratings

• DC Supply Voltage Range, (VDD): -0.5V to +20V (Voltage Referenced to VSS Terminals)
• Input Voltage Range, All Inputs: -0.5V to VDD +0.5V
• DC Input Current, Any One Input: ±10mA
• Operating Temperature Range: -55oC to +125oC Package Types D, F, K, H
• Storage Temperature Range (TSTG): -65oC to +150oC
• Lead Temperature (During Soldering): +265oC
  • At Distance 1/16 ± 1/32 Inch (1.59mm ± 0.79mm) from case for 10s Maximum

CD40108 Pinout Diagram

CD40108 Pin Description

Pin No	Pin Name	Description
1	Q3B	Word Register B Output 4
2	Q2B	Word Register B Output 3
3	3-STATE A	Three State Pin A
4	Q0A	Word Register A Output 1
5	Q1A	Word Register A Output 2
6	Q2A	Word Register A Output 3
7	Q3A	Word Register A Output 4
8	WRITE 0	Write 0 Pin
9	WRITE 1	Write 1 Pin
10	READ 1B	Read 1B Pin
11	READ 0B	Read 0B Pin
12	VSS	Supply Voltage
13	READ 0A	Read Pin
14	READ 1A	Read 1B Pin
15	WRITE ENABLE	Write Enable Pin
16	CLK	Clock Pin
17	D3	Data Input 4
18	D2	Data Input 3
19	D1	Data Input 2
20	D0	Data Input 1
21	3-STATE B	Three State Pin B
22	Q0B	Word Register B Output 1
23	Q1B	Word Register B Output 2
24	VDD	Drain Voltage

CD40108 Circuit

Applications

• Scratch-Pad Memories
• Arithmetic Units
• Data Storage

CD40108 Alternative Equivalent

Download CD40108-4×4-bit synchronous triple-port register Datasheet from the link given below.