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Hello, Please ask a question about DM74LS191M Datasheet
# Example questions:
➢ What is the maximum permissible supply voltage for this device?
➢ What is the maximum clock frequency that can be supported with a 50pf load?
➢ What are the typical input current values for a high signal applied to the enable pin versus the others pin?
1. Device Overview:
️· Type: This document pertains to a Fairchild Semiconductor device, likely a counter/divider IC (based on terms like "clock frequency" and "pulse width").
️· Disclaimer: Fairchild Semiconductor does not assume responsibility for the use of the described circuitry; patent licenses are not implied, and the device specifications can change without notice.
2. Electrical Characteristics (Absolute Maximum Ratings - implied, as no specific maximum voltage is given)
️· Supply Voltage (VCC): 4.75V to 5.25V
️· Free Air Operating Temperature: 0°C to 70°C
3. DC Electrical Characteristics (Typical Values – assumed, as no specific test conditions are provided)
| Parameter | Min | Nom | Max | Units | Notes |
|---|---|---|---|---|---|
| Supply Voltage (VCC) | 4.75 | 5 | 5.25 | V | |
| HIGH Level Input Voltage | 2 | V | |||
| LOW Level Input Voltage | 0.8 | V | |||
| HIGH Level Output Current | -0.4 | A | |||
| LOW Level Output Current | 8 | A | |||
| Clock Frequency | 0 | 20 | MHz | ||
| Pulse Width | 25 | ns | Load condition | ||
| Data Setup Time | 20 | ns | |||
| Data Hold Time | 0 | ns | |||
| Enable Time to Clock | 30 | ns |
| Parameter | From (Input) | To (Output) | Min | Max | Units | Notes |
|---|---|---|---|---|---|---|
| Maximum Clock Frequency | N/A | N/A | 20 | N/A | MHz | |
| Propagation Delay Time | N/A | LOW-to-HIGH Level Output | 33 | 43 | ns | Any Q |
| Propagation Delay Time | N/A | HIGH-to-LOW Level Output | 50 | 59 | ns | Any Q |
| Propagation Delay Time | N/A | LOW-to-HIGH Level Output | 22 | 26 | ns | Data to Any Q |
| Propagation Delay Time | N/A | HIGH-to-LOW Level Output | 50 | 62 | ns | Data to Any Q |
| Propagation Delay Time | N/A | Clock to Ripple Clock | 20 | 24 | ns | |
| Propagation Delay Time | N/A | Clock to Ripple Clock | 24 | 33 | ns | |
| Propagation Delay Time | N/A | Clock to Any Q | 24 | 29 | ns | |
| Propagation Delay Time | N/A | Clock to Any Q | 36 | 45 | ns | |
| Propagation Delay Time | N/A | Clock to Max/Min | 42 | 47 | ns | |
| Propagation Delay Time | N/A | Clock to Max/Min | 52 | 65 | ns | |
| Propagation Delay Time | N/A | Up/Down to Ripple Clock | 45 | 50 | ns | |
| Propagation Delay Time | N/A | Up/Down to Ripple Clock | 45 | 54 | ns | |
| Propagation Delay Time | N/A | Down/Up to Max/Min | 33 | 36 | ns | |
| Propagation Delay Time | N/A | Down/Up to Max/Min | 33 | 42 | ns | |
| Propagation Delay Time | N/A | Enable to Ripple Clock | 33 | 36 | ns | |
| Propagation Delay Time | N/A | Enable to Ripple Clock | 33 | 42 | ns |
1. Device Overview:
️· Type: This document pertains to a Fairchild Semiconductor device, likely a counter/divider IC (based on terms like "clock frequency" and "pulse width").
️· Disclaimer: Fairchild Semiconductor does not assume responsibility for the use of the described circuitry; patent licenses are not implied, and the device specifications can change without notice.
2. Electrical Characteristics (Absolute Maximum Ratings - implied, as no specific maximum voltage is given)
️· Supply Voltage (VCC): 4.75V to 5.25V
️· Free Air Operating Temperature: 0°C to 70°C
3. DC Electrical Characteristics (Typical Values – assumed, as no specific test conditions are provided)
| Parameter | Min | Nom | Max | Units | Notes |
|---|---|---|---|---|---|
| Supply Voltage (VCC) | 4.75 | 5 | 5.25 | V | |
| HIGH Level Input Voltage | 2 | V | |||
| LOW Level Input Voltage | 0.8 | V | |||
| HIGH Level Output Current | -0.4 | A | |||
| LOW Level Output Current | 8 | A | |||
| Clock Frequency | 0 | 20 | MHz | ||
| Pulse Width | 25 | ns | Load condition | ||
| Data Setup Time | 20 | ns | |||
| Data Hold Time | 0 | ns | |||
| Enable Time to Clock | 30 | ns |
| Parameter | From (Input) | To (Output) | Min | Max | Units | Notes |
|---|---|---|---|---|---|---|
| Maximum Clock Frequency | N/A | N/A | 20 | N/A | MHz | |
| Propagation Delay Time | N/A | LOW-to-HIGH Level Output | 33 | 43 | ns | Any Q |
| Propagation Delay Time | N/A | HIGH-to-LOW Level Output | 50 | 59 | ns | Any Q |
| Propagation Delay Time | N/A | LOW-to-HIGH Level Output | 22 | 26 | ns | Data to Any Q |
| Propagation Delay Time | N/A | HIGH-to-LOW Level Output | 50 | 62 | ns | Data to Any Q |
| Propagation Delay Time | N/A | Clock to Ripple Clock | 20 | 24 | ns | |
| Propagation Delay Time | N/A | Clock to Ripple Clock | 24 | 33 | ns | |
| Propagation Delay Time | N/A | Clock to Any Q | 24 | 29 | ns | |
| Propagation Delay Time | N/A | Clock to Any Q | 36 | 45 | ns | |
| Propagation Delay Time | N/A | Clock to Max/Min | 42 | 47 | ns | |
| Propagation Delay Time | N/A | Clock to Max/Min | 52 | 65 | ns | |
| Propagation Delay Time | N/A | Up/Down to Ripple Clock | 45 | 50 | ns | |
| Propagation Delay Time | N/A | Up/Down to Ripple Clock | 45 | 54 | ns | |
| Propagation Delay Time | N/A | Down/Up to Max/Min | 33 | 36 | ns | |
| Propagation Delay Time | N/A | Down/Up to Max/Min | 33 | 42 | ns | |
| Propagation Delay Time | N/A | Enable to Ripple Clock | 33 | 36 | ns | |
| Propagation Delay Time | N/A | Enable to Ripple Clock | 33 | 42 | ns |
| Part No. | DM74LS191M |
| Manufacturer | FAIRCHILD |
| Size | 72 Kbytes |
| Pages | 6 pages |
| Description | Synchronous 4-Bit Up/Down Counter with Mode Control |
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