ST4G3235
ST4G3235 is 4-BIT DUAL SUPPLY BUS BUFFER LEVEL TRANSLATOR manufactured by STMicroelectronics.
DESCRIPTION
The ST4G3235 is a dual supply low voltage CMOS 4-BIT BUS BUFFER level translator fabricated with sub-micron silicon gate and five-layer metal wiring C2MOS technology. Designed for use as an interface between a 3.3V bus and a 2.5V or 1.8V bus in a mixed 3.3V/1.8V, 3.3V/2.5V, 1.8V/1.4V and 2.5V/1.8V supply systems, it achieves high speed operation while maintaining the CMOS low power dissipation. This IC is intended for one-way asynchronous munication between data buses. The input and output power down protections disable the device when both power supply are down, so that the buses are effectively isolated. The input tolerant buffers allow to translate VCCB patible signals and greater signals than VCCB up/down to VCCA and viceversa.
May 2005 Rev. 6 1/13
Figure 2: Input And Output Equivalent Circuit
Table 2: Pin Description
PIN° A1 A3 A5 A7 C1 C3 C5 C7 B2 B6 B4 SYMBOL A4 A3 A2 A1 B4 B3 B2 B1 GND VCCA VCCB NAME AND FUNCTION Data Output (VCCA referred) Data Output (VCCA referred) Data Output (VCCA referred) Data Output (VCCA referred) Data Input (VCCB referred) Data Input (VCCB referred) Data Input (VCCB referred) Data Input (VCCB referred) Ground (0V) Positive Supply Voltage Positive Supply Voltage
Figure 3: Pin Connection (top through view)
2/13
Table 3: Truth Table
INPUTS Bn (VCCB Referred) L H n = 1..2
OUTPUTS An (VCCA Referred) L H
INPUTS An (VCCB Referred) L H n = 3..4
OUTPUTS Bn (VCCA Referred) L H
Table 4: Absolute Maximum Ratings
Symbol VCCA VCCB VO VI VOA VOB VIA VIB IIK IOK IOA ICCA ICCB Pd Tstg TL Output Supply Voltage Input Supply Voltage DC Output Voltage (Power Down Mode: VCCA=VCCB=Gnd) DC Input Voltage (Power Down Mode: VCCA=VCCB=Gnd) DC Output Voltage (A1, A2 Outputs) DC Output Voltage (B3, B4 Outputs) DC Input...
