Specifications
| Type | Description |
|---|---|
| Part Number | PCA9536 |
| Manufacturer | Texas Instruments |
| Product Type | Operational Amplifier |
| Category | Signal Chain |
| Package / Case | SOIC-8 D, 4.90 mm x 3.91 mm; VSSOP-8 DGK, 3.00 mm x 3.00 mm |
| Supply Voltage Range | 2.3 to 5.5 V; recommended operating condition |
| I2C Bus Speed | 400 kHz; Fast I2C bus support |
| I/O Port Count | 4 bits; P0 to P3 general-purpose I/O ports |
| I/O Default Power-Up State | Inputs with weak pullup to VCC; at power on |
| I/O Voltage Tolerance | 5-V tolerant; I/O ports |
| Pin P0 Function | P-port input-output, push-pull; pin 1 |
| Pin P1 Function | P-port input-output, push-pull; pin 2 |
| Pin P2 Function | P-port input-output, push-pull; pin 3 |
| Pin P3 Function | P-port input-output, push-pull; pin 5 |
| SCL Pin Function | Serial clock bus; pin 6; connect to VCC through pullup resistor |
| SDA Pin Function | Serial data bus; pin 7; connect to VCC through pullup resistor |
| Absolute Maximum Supply Voltage | -0.5 to 6 V; VCC |
| Absolute Maximum Input Voltage | -0.5 to 6 V; VI |
| Absolute Maximum Output Voltage | -0.5 to 6 V; VO |
| Input Clamp Current | -20 mA; VI < 0 |
| Output Clamp Current | -20 mA; VO < 0 |
| Input/Output Clamp Current | +/-20 mA; VO < 0 or VO > VCC |
| Continuous Output Low Current | 50 mA; VO = 0 to VCC |
| Continuous Output High Current | -50 mA; VO = 0 to VCC |
| Continuous Current Through GND | -200 mA; absolute maximum rating |
| Continuous Current Through VCC | 160 mA; absolute maximum rating |
| Storage Temperature | -65 to 150 °C; Tstg |
| HBM ESD Rating | 2000 V; Human body model, per ANSI/ESDA/JEDEC JS-001, all pins |
| CDM ESD Rating | 1000 V; Charged device model, per JEDEC JESD22-C101, all pins |
| SCL/SDA High-Level Input Voltage | 0.7 x VCC to 5.5 V; recommended operating condition |
| P-Port High-Level Input Voltage | 2 to 5.5 V; P3-P0 recommended operating condition |
| SCL/SDA Low-Level Input Voltage | -0.5 to 0.3 x VCC V; recommended operating condition |
| P-Port Low-Level Input Voltage | -0.5 to 0.8 V; P3-P0 recommended operating condition |
| High-Level Output Current | -10 mA; P3-P0 recommended operating condition |
| Low-Level Output Current | 25 mA; P3-P0 recommended operating condition |
| Operating Free-Air Temperature | -40 to 85 °C; TA recommended operating condition |
| Junction-to-Ambient Thermal Resistance | 141.9 °C/W; D SOIC-8 package |
| Junction-to-Ambient Thermal Resistance | 183.7 °C/W; DGK VSSOP-8 package |
| Input Diode Clamp Voltage | -1.2 to 0 V; II = -18 mA, VCC = 2.3 V to 5.5 V |
| Power-On Reset Voltage Rising | 1.2 to 1.6 V; VI = VCC or GND, IO = 0 |
| Power-On Reset Voltage Falling | 0.75 to 1 V; VI = VCC or GND, IO = 0 |
| P-Port High-Level Output Voltage | 1.8 V min; VCC = 2.3 V, IOH = -8 mA |
| P-Port High-Level Output Voltage | 2.6 V min; VCC = 3 V, IOH = -8 mA |
| P-Port High-Level Output Voltage | 4.1 V min; VCC = 4.5 V or 4.75 V, IOH = -8 mA |
| SDA Low-Level Output Current | 3 mA min, 10 mA max; VOL = 0.4 V, VCC = 2.3 V to 5.5 V |
| P-Port Low-Level Output Current | 8 mA min, 10 to 32 mA max; VOL = 0.5 V, VCC = 2.3 V to 4.75 V |
| P-Port Low-Level Output Current | 10 mA min, 13 to 44 mA max; VOL = 0.7 V, VCC = 2.3 V to 4.75 V |
| SCL/SDA Input Current | +/-1 µA; VI = VCC or GND, VCC = 2.3 V to 5.5 V |
| P-Port High-Level Input Current | 1 µA max; VI = VCC, VCC = 2.3 V to 5.5 V |
| P-Port Low-Level Input Current | -100 µA; VI = GND, VCC = 2.3 V to 5.5 V |
| Operating Mode Supply Current | 73 µA typ, 150 µA max; VCC = 5.5 V, VI = VCC, IO = 0, I/O = inputs, fscl = 400 kHz |
| Operating Mode Supply Current | 14 µA typ, 25 µA max; VCC = 5.5 V, VI = VCC, IO = 0, I/O = inputs, fscl = 100 kHz |
| Standby Mode Supply Current | 0.25 µA typ, 1.8 µA max; VCC = 5.5 V, VI = VCC, IO = 0, I/O = inputs, fscl = 0 kHz |
| Additional Standby Current | 0.35 mA typ; one input at VCC - 0.6 V, other inputs at VCC or GND, VCC = 2.3 V to 5.5 V |
| SCL Input Capacitance | 4 pF typ, 5 pF max; VI = VCC or GND, VCC = 2.3 V to 5.5 V |
| SDA I/O Capacitance | 5 pF typ, 6.5 pF max; VIO = VCC or GND, VCC = 2.3 V to 5.5 V |
| P-Port I/O Capacitance | 7.5 pF typ, 9.5 pF max; VIO = VCC or GND, VCC = 2.3 V to 5.5 V |
| Standard Mode I2C Clock Frequency | 0 to 100 kHz; recommended I2C timing |
| Standard Mode I2C Clock High Time | 4 µs min; tsch |
| Standard Mode I2C Clock Low Time | 4.7 µs min; tscl |
| Standard Mode I2C Spike Time | 50 ns max; tsp |
| Standard Mode I2C Serial Data Setup Time | 250 ns min; tsds |
| Standard Mode I2C Serial Data Hold Time | 0 ns min; tsdh |
| Standard Mode I2C Input Rise Time | 1000 ns max; ticr |
| Standard Mode I2C Input Fall Time | 300 ns max; ticf |
| Standard Mode I2C Output Fall Time | 300 ns max; 10-pF to 400-pF bus |
| Standard Mode I2C Bus Free Time | 4.7 µs min; between Stop and Start |
| Datasheet Status | request_only |
Product Overview
The PCA9536 is a Texas Instruments 4-bit I2C I/O expander in the Signal_Chain category. It provides four general-purpose P0 to P3 ports, with each P-port defined as a push-pull input-output. At power on, the I/O ports default to inputs with weak pullup to VCC, and the I/O ports are 5-V tolerant.
The recommended supply range is 2.3 to 5.5 V. I2C operation supports Standard Mode from 0 to 100 kHz and Fast I2C bus operation up to 400 kHz. SCL is the serial clock bus on pin 6 and SDA is the serial data bus on pin 7; both are specified to connect to VCC through pullup resistors.
Package options are SOIC-8 D at 4.90 mm x 3.91 mm and VSSOP-8 DGK at 3.00 mm x 3.00 mm. The recommended operating free-air temperature range is -40 to 85 °C, with junction-to-ambient thermal resistance of 141.9 °C/W for SOIC-8 and 183.7 °C/W for VSSOP-8. Applications include I2C-based expansion of four digital I/O lines, push-pull P-port control, and low-current standby I/O interfaces.
Key Features
- 4-bit P0 to P3 general-purpose I/O port expansion
- 2.3 to 5.5 V recommended supply operation
- Fast I2C bus support up to 400 kHz
- I/O ports power up as weak-pullup inputs
- 5-V tolerant P-port I/O interface
- P0 to P3 push-pull input-output ports
- SCL and SDA require pullup resistors to VCC
- -40 to 85 °C operating free-air temperature
- 0.25 µA typical standby supply current at 5.5 V
- SOIC-8 and VSSOP-8 package options
Typical Applications
- I2C digital I/O expansion
- Four-bit GPIO control
- Push-pull P-port interfaces
- 5-V tolerant I/O connections
- Low-current standby I/O designs
- SCL/SDA serial bus systems
- SOIC-8 or VSSOP-8 assemblies
Procurement Notes
When requesting a quote for PCA9536, buyers should confirm the manufacturer, package or case, required quantity, target date code, compliance documents, packing method, destination country and expected delivery schedule.
If alternatives are acceptable, buyers should share the approved vendor list, required electrical or optical limits, package constraints and qualification requirements. Any alternative part should be reviewed by the buyer's engineering team before production use.
For analog and signal-chain sourcing, supply voltage, bandwidth, accuracy, noise level, package, temperature grade, input/output configuration and qualification requirements should be verified before approval.
FAQ
What supply voltage range does the PCA9536 support?
The PCA9536 has a recommended supply voltage range of 2.3 to 5.5 V. Absolute maximum VCC is specified from -0.5 to 6 V, so design operation should remain within the recommended operating range.
How many I/O ports are available on the PCA9536?
The PCA9536 provides 4 bits of general-purpose I/O through P0, P1, P2, and P3. Each P-port is specified as a push-pull input-output, and the ports power up as inputs with weak pullup to VCC.
What I2C clock speeds are specified for PCA9536?
The device supports Fast I2C bus operation up to 400 kHz. Standard Mode I2C timing is also specified from 0 to 100 kHz, with 4 µs minimum clock high time and 4.7 µs minimum clock low time.
What packages are listed for the PCA9536?
The listed package options are SOIC-8 D measuring 4.90 mm x 3.91 mm and VSSOP-8 DGK measuring 3.00 mm x 3.00 mm. Thermal resistance is 141.9 °C/W for SOIC-8 and 183.7 °C/W for VSSOP-8.
Technical Review & Sourcing Note
Prepared by LDeepAI Component Sourcing Team. Reviewed for RFQ, documentation and alternative sourcing use. Last updated: June 30, 2026.
This page is based on manufacturer datasheet information and LDeepAI sourcing review. Specifications should be verified against the official manufacturer datasheet before final procurement or design approval. Final electrical, optical and reliability approval should be confirmed by the buyer's engineering team.