The Keysight 44474A (formerly Agilent/HP 44474A) is a 16-bit digital input/output module designed for use with the 3488A Switch/Control Unit. It provides 16 bidirectional, TTL-compatible data lines that can be addressed individually, as two 8-bit ports, or as a single 16-bit word, along with 4 control and handshaking lines. Featuring open-collector outputs capable of sinking up to 125 mA and supporting external voltages up to 30 V, the module comes equipped with a screw terminal block for secure and convenient connectivity.
Specifications
General
| Parameter | Value |
|---|---|
| Interfaces | 16-bit bidirectional digital I/O, 4 control/handshake lines, screw terminals |
Physical
| Parameter | Value |
|---|---|
| Operating Temperature | 0 to 55 °C |
System & Chassis Architecture
| Parameter | Value |
|---|---|
| Compatible Mainframe | Agilent / HP 3488A Switch/Control Unit |
| Form Factor | Plug-in module |
Digital I/O Specifications
| Parameter | Value |
|---|---|
| Number of Data Lines | 16 bi-directional |
| Control & Handshake Lines | 4 lines |
| Logic Compatibility | TTL compatible |
| Output Configuration | Open collector |
| Input Configuration | TTL compatible |
| Maximum Sink Current | 125 mA per line |
| Maximum External Voltage | 30 V DC |
| Addressing Modes | Individual (bit-by-bit), dual 8-bit ports, or single 16-bit word |
Connectivity & Host Interfaces
| Parameter | Value |
|---|---|
| Connection Type | Screw terminal (included) |
Electrical Specifications
| Parameter | Value |
|---|---|
| Input High Voltage (VIH) | >= 2.0 V |
| Input Low Voltage (VIL) | <= 0.8 V |
| Output High Voltage (VOH) | >= 2.4 V (@ -400 µA) |
| Output Low Voltage (VOL) | <= 0.5 V (@ 125 mA) |
| Handshake Output Low Voltage (VOL) | <= 0.5 V (@ 8 mA) |
Power Requirements
| Parameter | Value |
|---|---|
| Power Consumption | 250 mA (maximum) @ +5 VDC (from mainframe) |
Configuration
| Parameter | Value |
|---|---|
| Port Configuration | Two independent 8-bit ports |
Electrical
| Parameter | Value |
|---|---|
| Built-in Power Output | +5 VDC at 150 mA maximum |
| Pull-up Resistors | 4.7 kΩ connected to +5 V (removable via internal jumpers) |
| Maximum Port Sink Current | 1.0 A (for each 8-bit port) |
Control
| Parameter | Value |
|---|---|
| Handshake Modes | Static, Strobe, and Handshake modes |
Technology
TTL Digital I/O
Applications
Automated test system control, digital pattern generation, and handshake interfacing
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