3470
CAMAC 24-Bit Digital Input Module

The 3470 is a single-width CAMAC module with a 24-bit register for holding binary input data. The module consists of six 4-bit registers, each having a strobe to allow independent latching of data from various sources. The strobes can be paralleled to allow strobing wider data words from one source.

The incoming data is latched two microseconds after the negative going edge of the strobe, which allows the strobe to be generated simultaneously with the data in the external device. The Read command causes the entire 24-bit register to be gated onto the Dataway.

Internal strobing of the data is allowed on command, and an input gate (continuous load) mode of operation is selectable by a front-panel switch.

CAMAC 24-Bit Digital Input Module: 3470

3470 Data Sheet

Supporting Chassis

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A LAM status flip-flop, associated with each of the six external strobes, becomes set two microseconds after the negative going edge of the strobe. The six LAM status bits are OR'ed and can be enabled to produce a LAM request. Which strobe caused the LAM request is determined by reading the LAM status register with the F(0)•A(0) Read and Clear command.

All external connections are made via the 36-pin edge connector located above the Dataway connector. All inputs (data and strobe) are low-true with a TRUE input being represented by an impedance to ground of less than 500 Ohms. (Noise amenity improves as the impedance to round is reduced.) Ground-connected relay contacts, TTL outputs, and common emitter transistor circuits are satisfactory sources of data. The inputs are diode-protected, and voltages applied to the input terminals may safely range between ±10 volts.

CAMAC Module Features

  • 24-Bit Data Input Register
  • 6 Independent 4-Bit Registers with Strobe
  • Front-Panel Switch Selects External Strobe or
    Continuous Load Mode of Operation
  • LAM Status Bits for Interrupt-Driven Systems

CAMAC Module Ordering Information

3470 Products and Part Numbers
24-Bit Data Input Register with Strobes,
36-Pin PC Edge Connector
3470-P1A