Fairchild 74VCX162245 service manual
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74VCX162245
Low Voltage 16-Bit Bidirectional Transceiver with 3.6V
Tolerant Inputs and Outpu ts and 26 Ω Series Resistors in
A Port Outputs
October 1996
Revised April 1999
74VCX162245 Low V oltage 16-Bi t Bidirectional Transceiver with 3.6V Tolerant Inputs and Outputs and 26Ω Series
Resistors in A Port Outputs
General Description
The VCX162245 contains sixteen non-inverting bidirectional buffers with 3-STATE outputs and is intended for bus
oriented applications. The device is byte controlled. Each
byte has separate 3-STATE control inputs which can be
shorted together for full 16-b it operation. The T/R
determine the direction of data flow through the device.
inputs disable bo th the A and B ports by placing
The OE
them in a high impedance state.
The 74VCX162245 is designed for low v oltage (1.65V to
3.6V) V
The 74VCX162245 i s al so d esig ned with 26Ω series re sis-
tance in the A Port outputs. This de sign redu ces line n oise
in applications such as memory address drivers, clock drivers, and bus transceivers/transmitters.
The 74VCX162245 is fab ricated with an advance d CMOS
technology to achieve high speed operation while maintaining low CMOS power dissipation.
applications with I/O compatibility up to 3.6V.
CC
inputs
Features
■ 1.65V–3.6V VCC supply operation
■ 3.6V tolerant inputs and outputs
■ 26Ω series resistors in A port outputs
(B to A)
■ t
PD
3.4 ns max for 3.0V to 3.6V V
4.3 ns max for 2.3V to 2.7V V
8.6 ns max for 1.65V to 1.95V V
■ Power-down high impedance inputs and outputs
■ Supports live insertion/withdrawal (Note 1)
■ Static Drive (I
±12 mA @ 3.0V V
±8 mA @ 2.3V V
±3 mA @ 1.65V V
■ Uses patented noise/EMI reduction circuitry
■ Latchup performance exceeds 300 mA
■ ESD performance:
Human body model > 2000V
Machine model >200V
Note 1: To ensure the high-impedance state d uring power up or power
should be tied to VCC through a pull-up r esistor; the min imum
down, OE
value of the res istor is d eter mine d by the cu rre nt-sou rcin g ca pa bility of t he
driver.
OH/IOL
A outputs)
CC
CC
CC
CC
CC
CC
Ordering Code:
Order Number Package Number Package Description
74VCX162245MTD MTD48 48-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 6.1mm Wide
Devices also availab le in Tape and Reel. Specify by appending th e s uffix let t er “X” to the ordering cod e.
Logic Symbol Pin Descriptions
Pin
Names
OE
T/R
A
0–A15
B
0–B15
© 1999 Fairchild Semiconductor Corporation DS500048.prf www.fairchildsemi.com
Output Enable Input
n
Transmit/Receive Input
n
Side A Inputs or 3-STATE Outputs
Side B Inputs or 3-STATE Outputs
Description
Connection Diagram Truth Tables
74VCX162245
OE
Inputs
1
T/R
1
Outputs
L L Bus B0–B7 Data to Bus A0–A
L H Bus A0–A7 Data to Bus B0–B
H X HIGH Z State on A0–A7, B0–B
OE
Inputs
2
T/R
2
Outputs
L L Bus B8–B15 Data to Bus A8–A
L H Bus A8–A15 Data to Bus B8–B
H X HIGH Z State on A8–A15, B8–B
H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial (HIGH or LOW, inputs and I/O’s may not float)
Z = High Impedance
7
7
7
15
15
15
Logic Diagram
www.fairchildsemi.com 2
Absolute Maximum Ratings(Note 2)
Supply Voltage (VCC) −0.5V to +4.6V
DC Input Voltage (V
Output Voltage (V
) −0.5V to +4.6V
I
)
O
Outputs 3-State −0.5V to +4.6V
Outputs Active (Note 3) −0.5 to V
DC Input Diode Current (I
DC Output Diode Current (I
< 0V −50 mA
V
O
> V
V
O
CC
) VI < 0V −50 mA
IK
)
OK
+ 0.5V
CC
+50 mA
DC Output Source/Sink Current
) ±50 mA
(I
OH/IOL
or Ground Current per
DC V
CC
Supply Pin (I
Storage Temperature Range (T
or Ground) ±100 mA
CC
) −65°C to +150°C
STG
Recommended Operating
Conditions
Power Supply
Operating 1.65V to 3.6V
Data Retention Only 1.2V to 3.6V
(Note 4)
Input Voltage −0.3V to 3.6V
Output Voltage (V
Output in Active States 0V to V
Output in 3-STATE 0.0V to 3.6V
Output Current in I
= 3.0V to 3.6V ±12 mA
V
CC
= 2.3V to 2.7V ±8 mA
V
CC
= 1.65V to 1.95V ±3 mA
V
CC
Output Current in ± I
= 3.0V to 3.6V ± 24mA
V
CC
= 2.3V to 2.7V ± 18mA
V
CC
= 1.65V to 2.3V ±6mA
V
CC
Free Air Operating T emperature (T
Minimum Input Edge Rate (∆t/∆V)
= 0.8V to 2.0V, VCC = 3.0V 10 ns/V
V
IN
Note 2: The “Absolute Maximum Ratings ” are those val ues beyond w hich
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 tables will def ine the conditions for actual device operation.
Absolute Maximum Rating must be observed.
Note 3: I
O
Note 4: Floating or unused pin s (inputs or I/O's) must b e held HIGH or
LOW.
DC Electrical Characteristics (2.7V < VCC ≤ 3.6V)
)
O
OH/IOL
OH/IOL
-A Outputs
-B Outputs
) −40°C to +85°C
A
74VCX162245
CC
Symbol Parameter Conditions
V
IH
V
IL
V
OH
V
OL
I
I
I
OZ
I
OFF
I
CC
∆I
Note 5: Outputs disab led or 3-STATE only.
HIGH Level Input Voltage 2.7–3.6 2.0 V
LOW Level Input Voltage 2.7–3.6 0.8 V
HIGH Level Output Voltage IOH = −100 µA 2.7–3.6 VCC − 0.2
A Outputs IOH = −6 mA 2.7 2.2 V
IOH = −8 mA 3.0 2.4
HIGH Level Output Voltage IOH = −100 µA 2.7–3.6 VCC − 0.2
B Outputs IOH = −12 mA 2.7 2.2 V
LOW Level Output Voltage IOL = 100 µA 2.7–3.6 0.2
A Outputs IOL = 6 mA 2.7 0.4 V
LOW Level Output Voltage IOL = 100 µA 2.7–3.6 0.2
B Outputs IOL = 12 mA 2.7 0.4 V
Input Leakage Current 0V ≤ VI ≤ 3.6V 2.7–3.6 ±5.0 µA
3-STATE Output Leakage 0V ≤ VO ≤ 3.6V 2.7–3.6 ±10 µA
Power Off Leakage Current 0V ≤ (VI, VO) ≤ 3.6V 0 10 µA
Quiescent Supply Current VI = VCC or GND 2.7–3.6 20
Increase in ICC per Input VIH = VCC − 0.6V 2.7–3.6 750 µA
CC
IOH = −12 mA 3.0 2.2
IOH = −18 mA 3.0 2.4
IOH = −24 mA 3.0 2.2
IOL = 8 mA 3.0 0.55
IOL = 12 mA 3.0 0.8
IOL = 18 mA 3.0 0.4
IOL = 24 mA 3.0 0.55
VI = VIH or V
VCC ≤ (VI, VO) ≤ 3.6V (Note 5) 2.7–3.6 ±20
IL
V
CC
(V)
Min Max Units
µA
3 www.fairchildsemi.com
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