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ST1G3234B
1-bit dual supply bus buffer level translator with A-side series resistor
Features
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High speed: tPD = 4.0 ns (max.) at TA = 85 °C VCCB = 1.65 V; VCCA = 3.0 V Low power dissipation: ICCA = ICCB = 5 μA (max.) at TA = 85 °C Symmetrical output impedance: |IOHA| = IOLA = 10 mA min at VCCA = 2.75 V; VCCB = 1.4 to 3.6 V |IOHA| = IOLA = 6 mA min. at VCCA = 2.3 V; VCCB = 1.4 to 3.6 V Balanced propagation delays: tPLH ≅ tPHL Power-down protection on inputs and outputs 26 Ω series resistor on A-side outputs Operating voltage range: – VCCA (opr.) = 1.4 to 3.6 V – VCCB (opr.) = 1.4 to 3.6 V Allows partial power-down when VCCA = 0, device consumes very low quiescent current Max data rates: – 380 Mbps (1.8 to 3.3 V translation) – 260 Mbps (<1.8 to 3.3 V translation) – 260 Mbps (translates to 2.5 V) – 210 Mbps (translates to 1.5 V) Latch-up performance exceeds 500 mA (JESD 17) ESD performance: HBM > 2000 V (MIL STD 883 method 3015); MM > 200 V ROHS compliant to Flip-Chip package
Flip-Chip 5
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Description
The ST1G3234B is a dual supply low voltage CMOS 1-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 3.3 V bus and a 2.5 V or 1.8 V bus in a mixed 3.3 V/1.8 V, 3.3 V/2.5 V, 1.8 V/1.4 V and 2.5 V/1.8 V supply systems, it achieves high speed operation while maintaining the CMOS low power dissipation. The ST1G3234B is intended for one-way asynchronous communication 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 compatible signals and greater signals than VCCB up/down to VCCA. All inputs are equipped with protection circuits against static discharge, giving them ESD immunity and transient excess voltage. The ST1G3234B is VCCA = 0 V tolerant, achieving very low current consumption when the VCCA is grounded.
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Table 1.
Device summary
Order code ST1G3234BBJR Package Flip-Chip 5 Comments 4000 parts per reel
December 2007
Rev 2
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Contents
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ST1G3234B
Contents
1 Pin settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1 1.2 Pin connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2 3
Device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Maximum rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3.1 Recommended operating conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
4 5 6 7 8
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Test circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
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ST1G3234B
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Pin settings
1
1.1
Pin settings
Pin connection
Figure 1. Pin connection (top through view)
1.2
Pin description
Table 2. Pin description
Pin number A1 C1 B2 A3 C3 Symbol A1 B1 GND VCCA VCCB Name and function Data output (VCCA referred) Data input (VCCB referred) Ground (0V) Positive supply voltage Positive supply voltage
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Device summary
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ST1G3234B
2
Device summary
Figure 2. Input equivalent circuit
VCCA
Overvolt. control
B1 R S = (26Ω) A1
ESD protection GND GND GND
CS21760A
Figure 3.
Logic diagram
VCCB V CCA
B1
ST1G3234B
A1
CS21000A
Table 3.
Truth table
Inputs B1 (VCCB referred) L H Outputs A1 (VCCA referred) L H
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ST1G3234B
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Maximum rating
3
Maximum rating
Stressing the device above the rating listed in the “Absolute maximum ratings” table may cause permanent damage to the device. These are stress ratings only and operation of the device at these or any other conditions above those indicated in the Operating sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Refer also to the STMicroelectronics SURE Program and other relevant quality documents. Table 4.
Symbol VCCA VCCB VOA VIB VOA 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 DC input voltage DC input diode current DC output diode cu.