The Keysight (Agilent/HP) 16555A is a high-performance state and timing analysis module designed for the HP 16500 series logic analysis mainframes. It offers 68 channels of state and timing acquisition, featuring deep 1 M acquisition memory per channel (expandable to 2 M in half-channel mode), state clock speeds up to 110 MHz, and timing analysis sample rates up to 500 MHz. Designed for troubleshooting digital circuits, it provides versatile trigger sequencing, precise threshold controls, and comprehensive probing options.
Specifications
General
| Parameter | Value |
|---|---|
| Interfaces | HP-IB, RS-232-C (via mainframe) |
| Display | Mainframe-dependent (supports waveform, mixed state/timing, and interleaved state/state listings) |
Physical
| Parameter | Value |
|---|---|
| Power Supply | Powered via mainframe backplane |
| Operating Temperature | 0 °C to +55 °C |
| Weight | 1.4 kg |
| Module Slot Width | 1 slot |
Acquisition & Performance
| Parameter | Value |
|---|---|
| Total Channels | 68 channels (64 data channels, 4 clock channels) |
| Max State Clock Speed (Single Clock, Single Edge) | 110 MHz |
| Max State Clock Speed (Multiple Clocks/Edges) | 100 MHz |
| Max Timing Sample Rate | 500 MHz (half-channel mode) |
| Minimum State Clock Pulse Width | 3.5 ns |
| Channel Expandability | Expandable up to 340 channels (5 modules) |
Memory & Tagging
| Parameter | Value |
|---|---|
| Memory Depth (All Channels) | 1 M samples |
| Memory Depth (Half-Channel Mode) | 2 M samples |
| State Tagging Modes | Time tagging or number-of-qualified-states tagging |
| Time Tagging Resolution | 4 ns |
| Maximum Time Count Between States | 17.2 seconds |
| Maximum State Tag Count | 4.29 x 10^9 |
Triggering & Analysis
| Parameter | Value |
|---|---|
| State Trigger Sequence Levels | 12 levels |
| Pattern Resource Terms | 10 terms (available for both state and timing) |
| Range Terms | 2 terms (available for both state and timing) |
| Timer/Counter Resources | 2 (available for both state and timing) |
| Edge Terms | 2 terms (timing analyzer only) |
| External Arming | Bidirectional arming to and from other modules through the intermodule bus |
Probing & Connectivity
| Parameter | Value |
|---|---|
| Supported Probes | Lightweight passive probes |
| Probe Compatibility | Compatible with previous HP logic analyzers and preprocessors |
Accuracy & Timing Parameters
| Parameter | Value |
|---|---|
| Threshold Accuracy | ±(100 mV + 3% of threshold setting) |
| Sample Period Accuracy | 0.01% of sample period |
| Channel-to-Channel Skew | 2 ns typical |
| Time Interval Accuracy | ±(sample period + channel-to-channel skew + 0.01% of time interval reading) |
Measurement & Display
| Parameter | Value |
|---|---|
| Marker Measurements | Supported |
| Programmability | Fully programmable |
System Integration
| Parameter | Value |
|---|---|
| Compatible Mainframes | HP 16500B, HP 16500C |
Signal Inputs
| Parameter | Value |
|---|---|
| Input Resistance | 100 kΩ |
| Input Capacitance | 8 pF |
| Threshold Range | -6.0 V to +6.0 V |
| Threshold Setting Resolution | 50 mV |
| Minimum Input Voltage Swing | 500 mV p-p |
Performance
| Parameter | Value |
|---|---|
| Glitch Triggering Minimum Width | 3.5 ns |
Electrical
| Parameter | Value |
|---|---|
| Maximum Input Voltage | ±40 V peak |
| Dynamic Range | ±10 V about threshold |
Power Requirements
| Parameter | Value |
|---|---|
| Power Supply Current (+5 V) | 4.5 A max (from mainframe) |
| Power Supply Current (-5.2 V) | 1.8 A max (from mainframe) |
Technology
logic analyzer
Applications
Digital circuit troubleshooting, bus analysis, microprocessor debugging, timing and state verification
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