Revised June 2005
74VCX163245
Low Voltage 16-Bit Dual Supply Translating Transceiver
with 3-STATE Outputs
General Description
Features
The VCX163245 is a dual supply, 16-bit translating transceiver that is designed for 2 way asynchronous communication between busses at different supply voltages by
providing true signal translation. The supply rails consist of
VCCA, which is a higher potential rail operating at 2.3V to
3.6V and VCCB, which is the lower potential rail operating at
1.65V to 2.7V. (VCCB must be less than or equal to VCCA
for proper device operation). This dual supply design
allows for translation from 1.8V to 2.5V busses to busses at
a higher potential, up to 3.3V.
■ Bidirectional interface between busses ranging from
1.65V to 3.6V
The Transmit/Receive (T/R) input determines the direction
of data flow. Transmit (active-HIGH) enables data from A
Ports to B Ports; Receive (active-LOW) enables data from
B Ports to A Ports. The Output Enable (OE) input, when
HIGH, disables both A and B Ports by placing them in a
High-Z condition. The A Port interfaces with the higher voltage bus (2.7V to 3.3V); The B Port interfaces with the lower
voltage bus (1.8V to 2.5V). Also the VCX163245 is
designed so that the control pins (T/Rn, OEn) are supplied
by VCCB.
The 74VCX163245 is suitable for mixed voltage applications such as notebook computers using a 1.8V CPU and
3.3V peripheral components. It is fabricated with an
Advanced CMOS technology to achieve high speed operation while maintaining low CMOS power dissipation.
■ Supports Live Insertion and Withdrawal (Note 1)
■ Static Drive (IOH/IOL)
r24 mA @ 3.0V VCC
r18 mA @ 2.3V VCC
r6 mA @ 1.65V VCC
■ Uses patented Quiet Series¥ noise/EMI reduction
circuitry
■ Functionally compatible with 74 series 16245
■ Latchup performance exceeds 300 mA
■ ESD performance:
Human Body Model !2000V
Machine model !200V
■ Also packaged in plastic Fine-Pitch Ball Grid Array
(FBGA)
Note 1: To ensure the high impedance state during power up or power
down, OEn should be tied to VCCB through a pull up resistor. The minimum
value of the resistor is determined by the current sourcing capability of the
driver.
Ordering Code:
Order Number
Package Number
74VCX163245G
(Note 2)(Note 3)
74VCX163245MTD
(Note 3)
BGA54A
MTD48
Package Description
54-Ball Fine-Pitch Ball Grid Array (FBGA), JEDEC MO-205, 5.5mm Wide
48-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 6.1mm Wide
Note 2: Ordering code “G” indicates Trays.
Note 3: Device also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Logic Diagram
Quiet Series¥ is a trademark of Fairchild Semiconductor Corporation.
© 2005 Fairchild Semiconductor Corporation
ds500168
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74VCX163245 Low Voltage 16-Bit Dual Supply Translating Transceiver with 3-STATE Outputs
March 2000
74VCX163245
Connection Diagrams
Pin Descriptions
Pin Names
Pin Assignment for TSSOP
Description
OEn
Output Enable Input (Active LOW)
T/Rn
Transmit/Receive Input
A0–A15
Side A Inputs or 3-STATE Outputs
B0–B15
Side B Inputs or 3-STATE Outputs
NC
No Connect
FBGA Pin Assignments
1
2
3
4
5
6
A
B0
NC
T/R1
OE1
NC
A0
B
B2
B1
NC
NC
A1
A2
C
B4
B3
VCCB
VCCA
A3
A4
D
B6
B5
GND
GND
A5
A6
E
B8
B7
GND
GND
A7
A8
F
B10
B9
GND
GND
A9
A10
A12
G
B12
B11
VCCB
VCCA
A11
H
B14
B13
NC
NC
A13
A14
J
B15
NC
T/R2
OE2
NC
A15
Truth Tables
Inputs
OE1
Pin Assignment for FBGA
T/R1
Outputs
L
L
L
H
Bus B0–B7 Data to Bus A0–A7
Bus A0–A7 Data to Bus B0–B7
H
X
HIGH Z State on A0–A7, B0–B7
Inputs
OE2
Outputs
L
L
L
H
Bus B8–B15 Data to Bus A8–A15
Bus A8–A15 Data to Bus B8–B15
H
X
HIGH-Z State on A8–A15, B8–B15
H HIGH Voltage Level
L LOW Voltage Level
X Immaterial (HIGH or LOW, inputs may not float)
Z High Impedance
(Top Thru View)
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T/R2
2
pins should be placed at logic LOW (0V) level, this will
ensure that the B-side bus pins are configured as inputs to
help guard against bus contention and oscillations. B-side
Data Inputs should be driven to a valid logic level (0V or
VCCB), this will prevent excessive current draw and oscillations. VCCA can then be powered up after VCCB, however
VCCA must be greater than or equal to VCCB to ensure
proper device operation. Upon completion of these steps
the device can then be configured for the users desired
operation. Following these steps will help to prevent possible damage to the translator device as well as other system
components.
To guard against power up problems, some simple guidelines need to be adhered to. The VCX163245 is designed
so that the control pins (T/Rn, OEn) are supplied by VCCB.
Therefore the first recommendation is to begin by powering
up the control side of the device, VCCB. The OEn control
pins should be ramped with or ahead of VCCB, this will
guard against bus contentions and oscillations as all A Port
and B Port outputs will be disabled. To ensure the high
impedance state during power up or power down, OEn
should be tied to VCCB through a pull up resistor. The minimum value of the resistor is determined by the current
sourcing capability of the driver. Second, the T/Rn control
Logic Diagrams
Please note that these diagrams are provided only for the understanding of logic operations and should not be used to estimate propagation delays.
3
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74VCX163245
VCX163245 Translator Power Up Sequence Recommendations
74VCX163245
Absolute Maximum Ratings(Note 4)
Recommended Operating
Conditions (Note 6)
Supply Voltage
0.5V to 4.6V
0.5V to VCCA
0.5V to 4.6V
VCCA
VCCB
DC Input Voltage (VI)
Power Supply (Note 7)
DC Output Voltage (VI/O)
VCCA
2.3V to 3.6V
VCCB
1.65V to 2.7V
Input Voltage (VI) @ OE, T/R
0.5V to 4.6V
Outputs 3-STATE
Outputs Active (Note 5)
0.5V to VCCA 0.5V
0.5V to VCCB 0.5V
An
Bn
50 mA
DC Output Diode Current (IOK)
VO 0V
50 mA
50 mA
VO ! VCC
An
0V to VCCA
Bn
0V to VCCB
Output Current in IOH/IOL
DC Input Diode Current (IIK)
VI 0V
0V to VCCB
Input/Output Voltage (VI/O)
VCCA
3.0V to 3.6V
VCCA
2.3V to 2.7V
VCCB
2.3V to 2.7V
VCCB
1.65V to 1.95V
Free Air Operating Temperature (TA
r24 mA
r18 mA
r18 mA
r6 mA
40qC to 85qC
Minimum Input Edge Rate ('t/'V)
DC Output Source/Sink Current
r50 mA
r100 mA
(IOH/IOL)
DC VCC or Ground Current
VIN
Supply Pin (ICC or Ground)
65qC to 150qC
Storage Temperature (TSTG)
0.8V to 2.0V, VCC
3.0V
10 ns/V
Note 4: The “Absolute Maximum Ratings” are those values beyond which
the safety of the device cannot be guaranteed. The device should not be
operated at these limits. The parametric values defined in the Electrical
Characteristics tables are not guaranteed at the absolute maximum ratings.
The “Recommended Operating Conditions” table will define the conditions
for actual device operation.
Note 5: IO Absolute Maximum Rating must be observed.
Note 6: Unused inputs or I/O pins must be held HIGH or LOW. They may
not float.
Note 7: Operation requires: VCCB d VCCA
DC Electrical Characteristics (1.65V VCCB d 1.95V, 2.3V VCCA d 2.7V)
Symbol
VIHA
Parameter
HIGH Level Input Voltage An
VIHB
VILA
LOW Level Input Voltage
VILB
VOHA
VOHB
VOLA
VOLB
Conditions
VCCA
(V)
(V)
Min
1.65–1.95
2.3–2.7
1.6
Bn, T/R, OE
1.65–1.95
2.3–2.7
0.65 x VCCB
An
1.65–1.95
2.3–2.7
Bn, T/R, OE
HIGH Level Output Voltage
HIGH Level Output Voltage
Low Level Output Voltage
Low Level Output Voltage
Max
Units
V
V
0.7
V
0.35 x VCCB
V
1.65–1.95
2.3–2.7
IOH
100 PA
1.65–1.95
2.3–2.7
VCCA–0.2
IOH
18 mA
1.65
2.3–2.7
1.7
IOH
100 PA
1.65–1.95
2.3–2.7
VCCB–0.2
IOH
6 mA
1.65–1.95
2.3
1.25
IOL
100 PA
1.65–1.95
2.3–2.7
0.2
IOL
18 mA
1.65
2.3–2.7
0.6
IOL
100 PA
1.65–1.95
2.3–2.7
0.2
IOL
6 mA
1.65–1.95
2.3
0.3
1.65–1.95
2.3–2.7
r5.0
PA
1.65–1.95
2.3–2.7
r10
PA
II
Input Leakage Current @ OE, T/R
0V d VI d 3.6V
IOZ
3-STATE Output Leakage
0V d VO d 3.6V
OE
VI
VCCB
V
V
V
V
VIH or VIL
IOFF
Power Off Leakage Current
0d (VI, VO) d 3.6V
ICCA/ICCB
Quiescent Supply Current,
An
per supply, VCCA / VCCB
Bn, OE, & T/R
V CCA or GND
VCCB or GND
VCCA d An d 3.6V
VCCB d Bn, OE, T/R d 3.6V
'ICC
VCCB
0
0
10
PA
1.65–1.95
2.3–2.7
20
PA
1.65–1.95
2.3–2.7
r20
PA
Increase in ICC per Input, Bn, T/R, OE
VI
VCCB – 0.6V
1.65–1.95
2.3–2.7
750
PA
Increase in ICC per Input, An
VI
VCCA – 0.6V
1.65–1.95
2.3–2.7
750
PA
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4
Symbol
VIHA
Parameter
HIGH Level Input Voltage An
VIHB
VILA
Bn, T/R, OE
LOW Level Input Voltage An
VILB
VOHA
VOHB
VOLA
VOLB
Conditions
Bn, T/R, OE
HIGH Level Output Voltage
HIGH Level Output Voltage
LOW Level Output Voltage
LOW Level Output Voltage
VCCA
(V)
(V)
1.65–1.95
3.0–3.6
2.0
1.65–1.95
3.0–3.6
0.65 x VCCB
1.65–1.95
3.0–3.6
Min
Max
Units
V
V
0.8
V
0.35 x VCCB
V
1.65–1.95
3.0–3.6
IOH
100 PA
1.65–1.95
3.0–3.6
VCCA–0.2
IOH
24 mA
1.65
3.0–3.6
2.2
IOH
100 PA
1.65–1.95
3.0–3.6
VCCA–0.2
IOH
6 mA
1.65–1.95
3.0
1.25
IOL
100 PA
1.65–1.95
3.0–3.6
0.2
IOL
24 mA
1.65
3.0–3.6
0.55
IOL
100 PA
1.65–1.95
3.0–3.6
0.2
IOL
6 mA
1.65–1.95
3.0
0.3
1.65–1.95
3.0–3.6
r5.0
PA
1.65–1.95
3.0–3.6
r10
PA
0
0
10
PA
1.65–1.95
3.0–3.6
20
PA
1.65–1.95
3.0–3.6
r20
PA
II
Input Leakage Current @ OE, T/R
0V d VI d 3.6V
IOZ
3-STATE Output Leakage
0V d VO d 3.6V
OE*
VI
VCCB
V
V
V
V
VIH or VIL
IOFF
Power OFF Leakage Current
0 d (VI, VO) d 3.6V
ICCA/ICCB
Quiescent Supply Current,
An
per supply, VCCA/VCCB
Bn, OE, & T/R
V CCA or GND
VCCB or GND
VCCA d An d 3.6V
VCCB d Bn, OE, T/R d 3.6V
'ICC
VCCB
Increase in ICC per Input, Bn, T/R, OE
VI
VCCB 0.6V
1.65–1.95
3.0–3.6
750
PA
Increase in ICC per Input, An
VI
VCCA 0.6V
1.65–1.95
3.0–3.6
750
PA
DC Electrical Characteristics (2.3V VCCB d 2.7V, 3.0V d VCCA d 3.6V)
Symbol
VIHA
Parameter
HIGH Level Input Voltage An
VIHB
VILA
Conditions
Bn, T/R, OE
LOW Level Input Voltage An
VILB
Bn, T/R, OE
VCCB
VCCA
(V)
(V)
2.3–2.7
3.0–3.6
2.0
2.3–2.7
3.0–3.6
1.6
2.3–2.7
3.0–3.6
0.8
V
2.3–2.7
3.0–3.6
0.7
V
2.3–2.7
3.0–3.6
Min
Max
Units
V
V
VOHA
HIGH Level Output Voltage
IOH
100 PA
IOH
24 mA
2.3
3.0–3.6
2.2
VOHB
HIGH Level Output Voltage
IOH
100 PA
2.3–2.7
3.0–3.6
VCCB–0.2
IOH
18 mA
2.3–2.7
3.0
1.7
VOLA
LOW Level Output Voltage
IOL
100 PA
2.3–2.7
3.0–3.6
0.2
IOL
24 mA
2.3
3.0–3.6
0.55
VOLB
LOW Level Output Voltage
IOL
100 PA
2.3–2.7
3.0–3.6
0.2
IOL
18 mA
2.3–2.7
3.0
0.6
2.3–2.7
3.0–3.6
r5.0
PA
2.3–2.7
3.0–3.6
r10
PA
0
0
10
PA
2.3–2.7
3.0–3.6
20
PA
2.3–2.7
3.0–3.6
r20
PA
II
Input Leakage Current @ OE, T/R
0V d VI d 3.6V
IOZ
3-STATE Output Leakage @ An
0V d VO d 3.6V
OE
VI
VCCA
V
V
V
V
VIH or VIL
IOFF
Power OFF Leakage Current
0 d (VI, VO) d 3.6V
ICCA/ICCB
Quiescent Supply Current,
An
per supply, VCCA/VCCB
Bn, OE, & T/R
VCCA or GND
VCCB or GND
VCCA d An d 3.6V
VCCB d Bn, OE, T/R d 3.6V
'ICC
VCCA–0.2
Increase in ICC per Input, Bn, T/R, OE
VI
VCCB 0.6V
2.3–2.7
3.0–3.6
750
PA
Increase in ICC per Input, An
VI
VCCA 0.6V
2.3–2.7
3.0–3.6
750
PA
5
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74VCX163245
DC Electrical Characteristics (1.65V VCCB d 1.95V, 3.0V VCCA d 3.6V)
74VCX163245
AC Electrical Characteristics
TA
Symbol
Parameter
VCCB
40qC to 85qC, CL
1.65V to 1.95V
2.3V to 2.7V
VCCA
VCCB
VCCA
30 pF, RL
500:
1.65V to 1.95V
VCCB
2.3V to 2.7V
3.0V to 3.6V
VCCA
3.0V to 3.6V
Units
Min
Max
Min
Max
Min
Max
tPHL, tPLH
Propagation Delay, A to B
1.5
5.8
1.5
6.2
0.8
4.4
ns
tPHL, tPLH
Propagation Delay, B to A
0.8
5.5
0.6
5.1
0.6
4.0
ns
tPZL, tPZH
Output Enable Time, OE to B
1.5
8.3
1.5
8.2
0.8
4.6
ns
tPZL, tPZH
Output Enable Time, OE to A
0.8
5.3
0.6
5.1
0.6
4.0
ns
tPLZ, tPHZ
Output Disable Time, OE to B
0.8
4.6
0.8
4.5
0.8
4.4
ns
tPLZ, tPHZ
Output Disable Time, OE to A
0.8
5.2
0.6
5.6
0.6
4.8
ns
tosHL
Output to Output Skew
tosLH
(Note 8)
0.75
ns
5.0
0.5
Note 8: Skew is defined as the absolute value of the difference between the actual propagation delay for any two separate outputs of the same device. The
specification applies to any outputs switching in the same direction, either HIGH-to-LOW (tosHL) or LOW-to-HIGH (tosLH).
Dynamic Switching Characteristics
Symbol
VOLP
Parameter
Quiet Output Dynamic
Conditions
CL
30 pF, VIH
VCC, VIL
0V
Peak VOL, A to B
VOLP
Quiet Output Dynamic
CL
30 pF, VIH
VCC, VIL
0V
Peak VOL, B to A
VOLV
Quiet Output Dynamic
CL
30 pF, VIH
VCC, VIL
0V
Valley VOL, A to B
VOLV
Quiet Output Dynamic
CL
30 pF, VIH
VCC, VIL
0V
Valley VOL, B to A
VOHV
Quiet Output Dynamic
CL
30 pF, VIH
VCC, VIL
0V
Valley VOH, A to B
VOHV
Quiet Output Dynamic
CL
30 pF, VIH
VCC, VIL
0V
Valley VOH, B to A
TA
25qC
VCCB
VCCA
(V)
(V)
1.8
2.5
0.25
1.8
3.3
0.25
2.5
3.3
0.6
1.8
2.5
0.6
1.8
3.3
0.8
2.5
3.3
0.8
1.8
2.5
0.25
1.8
3.3
0.25
2.5
3.3
0.6
1.8
2.5
0.6
1.8
3.3
0.8
2.5
3.3
0.8
1.8
2.5
1.3
1.8
3.3
1.3
2.5
3.3
1.7
1.8
2.5
1.7
1.8
3.3
2.0
2.5
3.3
2.0
Units
Typical
V
V
V
V
V
V
Capacitance
Symbol
Parameter
TA
Conditions
25qC
Units
CIN
Input Capacitance
VCCB
2.5V, VCCA
3.3V, VI
0V or VCCA/B
5
pF
CI/O
Input/Output Capacitance
VCCB
2.5V, VCCA
3.3V, VI
0V or VCCA/B
6
pF
CPD
Power Dissipation Capacitance
VCCB
2.5V, VCCA
3.3V, VI
0V or VCCA/B
20
pF
f
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10MHz
6
74VCX163245
AC Loading and Waveforms
FIGURE 1. AC Test Circuit
TEST
SWITCH
tPLH, tPHL
OPEN
tPZL, tPLZ
6V at VCC 3.3 r0.3V;
VCC x 2 at VCC 2.5 r 0.2V; 1.8V r 0.15V
tPZH, tPHZ
GND
FIGURE 2. Waveform for Inverting and Non-inverting Functions
tR tF d 2.0 ns, 10% to 90%
FIGURE 3. 3-STATE Output High Enable and Disable Times for Low Voltage Logic
tR tF d 2.0 ns, 10% to 90%
FIGURE 4. 3-STATE Output Low Enable and Disable Times for Low Voltage Logic
tR tF d 2.0 ns, 10% to 90%
Symbol
VCC
3.3V r 0.3V
2.5V r 0.2V
1.8V r 0.15V
Vmi
1.5V
VCC /2
VCC /2
Vmo
1.5V
VCC /2
VCC /2
VX
VOL 0.3V
VOL 0.15V
VOL 0.15V
VY
VOH 0.3V
VOH 0.15V
VOH 0.15V
7
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74VCX163245
Physical Dimensions inches (millimeters) unless otherwise noted
54-Ball Fine-Pitch Ball Grid Array (FBGA), JEDEC MO-205, 5.5mm Wide
Package Number BGA54A
8
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48-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 6.1mm Wide
Package Number MTD48
Fairchild does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and
Fairchild reserves the right at any time without notice to change said circuitry and specifications.
LIFE SUPPORT POLICY
FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD
SEMICONDUCTOR CORPORATION. As used herein:
2. A critical component in any component of a life support
device or system whose failure to perform can be reasonably expected to cause the failure of the life support
device or system, or to affect its safety or effectiveness.
1. Life support devices or systems are devices or systems
which, (a) are intended for surgical implant into the
body, or (b) support or sustain life, and (c) whose failure
to perform when properly used in accordance with
instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the
user.
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9
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74VCX163245 Low Voltage 16-Bit Dual Supply Translating Transceiver with 3-STATE Outputs
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)