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Key Specifications
Part Number Description Status VCCA(Min)(V) VCCA(Max)(V) VCCB(Min)(V) VCCB(Max)(V) Max Data Rate(Mbps) No. of Bits Operating Temperature Range(℃) Pin/Package EV Kit Available?
UM3308H 8-Bit Bidirectional Voltage-Level Translator with Auto Direction Sensing and ±15kV ESD Protection ACTIVE 1.2 3.6 1.65 5.5 100 8 -40 to 85 20/CSP 2.4×1.9 Y
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Product Description
UM3308H is 8-channel bidirectional voltage level translator with auto direction sensing and ±15kV ESD protection. This 8-channel non-inverting translator uses two separate configurable power-supply rails. The A port is designed to track VCCA. VCCA accepts any supply voltage from 1.2V to 3.6V. The B port is designed to track VCCB. VCCB accepts any supply voltage from 1.65V to 5.5V. This allows for universal low-voltage bidirectional translation between any of the 1.2V, 1.5V, 1.8V, 2.5V, 3.3V, and 5V voltage nodes. Both I/O ports are auto-sensing; thus, no direction pin is required, making it ideal for data transfer between low-voltage ASICs/PLDs and higher voltage systems.
The UM3308H operates at a guaranteed data rate of 20Mbps over the entire specified operating voltage range. Within specific voltage domains, higher data rates are up to 100Mbps.
When the output-enable (OE) input is low, all outputs are placed in the high-impedance state. The UM3308H is designed so that the OE input circuit is supplied by VCCA.
To ensure the high-impedance state during power up or power down, OE should be tied to GND through a pull down resistor; the minimum value of the resistor is determined by the current-sourcing capability of the driver.
The UM3308H is available in CSP20 2.4×1.9 bump package and specially features in wafer backside coating process, making the chip more unbreakable.
- 1.2V to 3.6V on A Port and 1.65V to 5.5V on B Port (VCCA≤VCCB)
- VCC Isolation Feature – If Either VCC Input is at GND, All Outputs are in the High-Impedance State
- OE Input Circuit Referenced to VCCA
- Low Power Consumption
- Latch-Up Performance Exceeds 100mA
- ±15kV ESD Protection on B Ports
Typical Application Circuit

- Low-Voltage ASIC Level Translation
- Cell-Phone Cradles
- Portable POS Systems
- Portable Communication Devices
- Low-Cost Serial Interfaces
- Cell-Phones
- Telecommunications Equipment
Pin Configurations  

            (Bottom View)
Ball Mapping for UM3308H

                        Transparent Top View
Ordering Information
Part Number
Packaging Type
Marking Code
Shipping Qty
CSP20 2.4×1.9
Tape & Reel
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