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TTL Undershoot Clamp Circuit

IP.com Disclosure Number: IPCOM000081325D
Original Publication Date: 1974-May-01
Included in the Prior Art Database: 2005-Feb-27
Document File: 2 page(s) / 39K

Publishing Venue

IBM

Related People

Gani, VL: AUTHOR [+2]

Abstract

In the circuit depicted in the drawing, the undershoot clamp D3 of the TTL receiver circuit provides damping for below ground ringing of the unterminated transmission lines.

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TTL Undershoot Clamp Circuit

In the circuit depicted in the drawing, the undershoot clamp D3 of the TTL receiver circuit provides damping for below ground ringing of the unterminated transmission lines.

The TTL receiver circuit comprises transistors T1, T2, diodes D1, D2, D3 and resistors R1, R2 and R3. Diode D3 clamps the undershoot below ground, thereby precluding the overshoot from reaching circuit threshold. This prevents false switching of the circuit caused by line ringing at the receiver. The diode D3 may be connected to a tap on R1 to limit current. The single diode D3 will clamp at least four external input transmission lines.

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