CD40108-4x4-bit synchronous triple-port register
Package DIP Series CD4000 (CMOS)
CD40108 overview
CD40108 belongs to 4000 Series CMOS Logic Family of Integrated Circuits (IC's) constructed with N- and P-channel enhancement mode transistors. CD40108 has 4x4-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.
Datasheet
108612-ds.pdf
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 = 5V2V at VDD = 10V2.5V at VDD = 15V
- 1V at VDD = 5V
- 2V at VDD = 10V
- 2.5V at VDD = 15V
CD40108 pinout
| 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 |
Absolute maximum ratings
| Parameter | Value |
|---|---|
| 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 |
CD40108 applications
- Scratch-Pad Memories
- Arithmetic Units
- Data Storage
More about CD40108
Absolute Maximum Ratings
- Lead Temperature (During Soldering): +265oC
- At Distance 1/16 ± 1/32 Inch (1.59mm ± 0.79mm) from case for 10s Maximum
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