6132 Feb65

The DEC Maynard 6132 "Two Majority Gates" module, released on 2/18/65 and priced at $171.00, implements the three-variable majority function (AB+BC+CA+ABC). It is primarily used for generating carry or borrow signals in binary adders/subtracters and as a fast comparator for flip-flop registers, with a propagation delay of only 10 nanoseconds per stage.

Inverter inputs are equivalent to a 6105 type inverter. The carry input at pin P can be driven from an adjacent 6132 module's pin N, tied to ground, or connected to a -3.0V reference at pin K. It can also be conditioned from a standard inverter using a 10mA clamped load and an external silicon clamp to pin J, which sets the required voltage level for the analog majority gate; carry input loading can be up to 5mA.

Output pins M, N, and R are each standard 15mA inverters with 10mA clamped loads. A jumper can be installed to bring the internal carry connection between the two majority gates out to pin S as a test point, which can supply 5mA at -3V in addition to driving the second majority gate.

The module requires -15V at 150mA, +10V(A) at 0mA, and +10V(B) at 125mA. It should not be subjected to marginal checking of +10(B) voltage.