3640
CAMAC 16-Bit Up-Down Counter Module

The 3640 is a single-width CAMAC module containing four presettable, 16-bit, up-down counters. These counters accept TTL signals at rates from dc to 20 megahertz from either the front-panel LEMO connectors or the printed circuit edge connector.

Each counter can be read as well as written. Counting can be inhibited by Dataway Inhibit or from an external inhibit signal; a frontpanel switch enables the Dataway Inhibit. Counters can be individually cleared by Dataway command, and they can be connected in series for increased count capacity.

CAMAC 16-Bit Up-Down Counter Module: 3640

3640 Data Sheet

Supporting Chassis

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Each counter has both an overflow and an underflow LAM status bit. The resulting eight LAM status bits can be read and cleared individually or in pairs as the associated counter is cleared.

The LAM status bits are OR'ed, and a single enable provides for LAM requests to be asserted.

In addition to the eight input LEMO connectors and the two bridged LEMO connectors for external inhibit, the front panel contains a LED indicating LAM requests enabled and a LED indicator for each of the eight LAM status bits.

Inputs are protected for transient up to 50 volts.

CAMAC Module Features

  • 6 Seperate 16-bit Up-Down Counter Channels
  • 65,535 Counts per Channel
  • Counting Rates of DC to 20 MHz
  • TTL Level Inputs
  • Ability to Series-Connect Channels to Extend Capacity to 32-Bits
  • Overflow & Underflow LAM Status Bits per Channel
  • Separate Clear Command per Channel

CAMAC Module Ordering Information

3640 Products and Part Numbers
4 Channels, 20 MHz Up-Down Counter, 16-bits,
LEMO Connectors
3640-L1A