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ST16C32245TBR-E
14-bit dual supply bus transceiver level translator, A side series resistor 2-bit I2C lines
August 2014 DocID10865 Rev 4 1/24
ST16C3224514-bit dual supply bus transceiver level translator A side series 2
Features High speed: tPD = 4.4 ns (max) at TA = 85 °C
VCCA = 3.0 V and VCCB = 2.3 V Low power dissipation:
ICCA = ICCB = 20 µA (max) at TA = 85 °C Symmetrical output impedance:
|IOHA| = IOLA = 8 mA min
(VCCA = 3.0 V; VCCB = 1.65 V or 2.3 V)
|IOHB| = IOLB = 6 mA min
(VCCB = 1.65 V VCCA = 3.0 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) = 2.3 V to 3.6 V
VCCB (opr) = 1.65 V to 2.7 V Fast I2 C lines 1.8 V/2.8 V level translator:
400 kHz guaranteed data rate at CL = 15 pF
CMOS 14-bit bus transceiver fabricated with sub-
micron silicon gate and five-layer metal wiring 2 MOS 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 and
2.5 V/1.8 V supply systems, it achieves high
speed operation while maintaining the CMOS low
power dissipation. It also includes 2-bit I2 C level
translation.
This IC is intended for two-way asynchronous
communication between data buses and the
direction of data transmission is determined by
nDIR inputs. The enable inputs nG can be used to
disable the device so that the buses are
effectively isolated. The A-port interfaces with the
3 V bus, the B-port with the 2.5 V and 1.8 V bus.
All inputs are equipped with protection circuits
against static discharge, giving them 2 kV ESD
immunity and transient excess voltage. All floating
bus terminals during high Z state do not need an
external pull-up or pull-down resistor.
Table 1. Device summary
Contents ST16C322452/24 DocID10865 Rev 4
Contents General description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Pin settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52.1 Pin connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.2 I2C bus function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73.1 Recommended operating conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Test circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 207.1 µTFBGA42 package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
7.2 µTFBGA42 tape and reel information . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
DocID10865 Rev 4 3/24
ST16C32245 General description
1 General description
Figure 1. Logic diagram
General description ST16C32245
4/24 DocID10865 Rev 4
Figure 2. Input and output equivalent circuit
DocID10865 Rev 4 5/24
ST16C32245 Pin settings
2 Pin settings
2.1 Pin connection
Figure 3. Pin connections (top through view)
Table 2. Pin description
Pin settings ST16C32245
6/24 DocID10865 Rev 4
2.2 I2 C bus function
Note: Open: If I/OVA is not driven, the I/OVB goes in high level VCCB by the embedded 10 kΩ pull-
up resistor. If I/OVB is not driven, the I/OVA goes in high level VCCB by the embedded 10 kΩ
pull-up resistor.
Table 3. Truth table X = don’t care Z = high impedance
Table 4. I2 C bus function table
DocID10865 Rev 4 7/24
ST16C32245 Maximum ratings
3 Maximum ratings
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.
Table 5. Absolute maximum ratings
Maximum ratings ST16C32245
8/24 DocID10865 Rev 4
3.1 Recommended operating conditions
Table 6. Recommended operating conditions
DocID10865 Rev 4 9/24
ST16C32245 Electrical characteristics
4 Electrical characteristics
Table 7. DC specification for VCCA
Electrical characteristics ST16C32245
10/24 DocID10865 Rev 4 VCC range = 3.3 ± 0.3; 2.5 ± 0.2 V and 2.8 ± 0.1 V; 1.8 ± 0.15 V
Table 7. DC specification for VCCA (continued)
DocID10865 Rev 4 11/24
ST16C32245 Electrical characteristics
Table 8. DC specification for VCCB
Electrical characteristics ST16C32245
12/24 DocID10865 Rev 4 VCC range = 3.3 ± 0.3; 2.5 ± 0.2 V and 2.8 ± 0.1 V; 1.8 ± 0.15 V
Table 8. DC specification for VCCB (continued)
