I. Digital I/O – 32 ch, bidirectional, 5 V TTL/CMOS

• Channels: 32 independent DIO lines, 4 × 8‑bit ports (Port0–Port3)

• Config: per‑port input/output; merge to 8/16/32‑bit width

• Logic Levels:

  • Input Low: ≤ 0.8 V

  • Input High: ≥ 2.0 V

  • Output Low: ≤ 0.4 V (sink 24 mA)

  • Output High: ≥ 2.4 V (source 24 mA)

• Absolute Max Input: ‑0.3 V ~ +5 V

• Pull‑Up/Down: software selectable (100 kΩ data, 2.2 kΩ control)download.ni.com

II. Speed & Memory (main difference vs 6533)

• Max Pattern I/O Clock: 20 MHz (32‑bit parallel)download.ni.com

• Max Handshake Throughput: 80 MB/s (PCI)

• Onboard Memory: 64 MB total (2 × 32 MB independent banks, IN/OUT)download.ni.com

• FIFO: 32‑bit × 1024‑word (hardware)

• Transfer Modes: DMA, interrupt, programmed I/O

III. Timing & Triggering

• Sample Clock: internal/external; 20 MHz maxdownload.ni.com

• Change Detection: 150 ns resolutiondownload.ni.com

• Triggers: start/stop/reference; edge (10 ns min pulse) or patterndownload.ni.com

• Pattern Match: 32‑bit mask/compare

• Handshake Protocols: 6 modes (A/B/C, pulsed, strobed)

IV. Physical & Environmental

• Size: half‑length PCI, 17.5 × 10.7 cm (6.9 × 4.2 in)

• Weight: ~0.25 kg

• Temperature: 0 ~ 55 °C (oper); −20 ~ 70 °C (storage)

• Humidity: 10%–90%, non‑condensing

• Power: +5 V @ ~2 A (higher than 6533)

V. Connector & Wiring

• Connector: 68‑pin SCSI (compatible with SCB‑68, TB‑2715)

• Pinout: 32 DIO, +5 V, GND, handshake/trigger lines

• Cables: SH68‑68‑D1, SH68‑68‑E1

VI. PCI‑6533 vs PCI‑6534 (key differences)

VII. Core Advantages & Applications

• 32‑bit 5 V TTL/CMOS DIO, 20 MHz clock, 80 MB/s, 64 MB memory for long patterns/streaming

• Ideal for high‑speed ATE, digital pattern generation, parallel bus emulation, semiconductor test, industrial control requiring deep memory and fast deterministic I/O