SN75207, SN75207B DUAL SENSE AMPLIFIER FOR MOS MEMORIES OR DUAL HIGH-SENSITIVITY LINE RECEIVERS

SLLS096B - JULY 1973 - REVISED MAY 1995

features

• Plug-In Replacement for SN75107A and SN75107B With Improved Characteristics
• ±10-mV Input Sensitivity
• TTL-Compatible Circuitry
• Standard Supply Voltages . . . ±5 V
• Differential Input Common-Mode Voltage Range of ±3 V
• Strobe Inputs for Channel Selection
• Totem-Pole Outputs
• SN75207B Has Diode-Protected Input Stage for Power-Off Condition
• Sense Amplifier for MOS Memories
• Dual Comparator
• High-Sensitivity Line Receiver

description

The SN75207 and SN75207B are terminal-for-terminal replacements for the SN75107A and SN75107B, respectively. The improved input sensitivity makes them more suitable for MOS memory sense amplifiers and can result in faster memory cycles. Improved sensitivity also makes them more useful in line-receiver applications by allowing use of longer transmission line lengths. The '207 and '207B each features a TTL-compatible, active-pullup output.

The essential difference between the SN75207 and SN75207B can be seen in the schematics. Input protection diodes are in series with the collectors of the differential-input transistors of the SN75207B. These diodes are useful in certain party-line systems that may have multiple V_CC+ power supplies and may be operated with some of the V_CC+ supplies turned off. In such a system, if a supply is turned off and allowed to go to ground, the equivalent input circuit connected to that supply would be as follows:

This would be a problem in specific systems that might have the transmission lines biased to some potential greater than 1.4 V.

These devices are characterized for operation from 0°C to 70°C

View more information about generic part numbers:SN75207

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