IDT74AUCH16245
1.8V CMOS 16-BIT BUS TRANSCEIVER WITH 3-STATE OUTPUTS AND BUS-HOLD
INDUSTRIAL TEMPERATURE RANGE
1.8V CMOS 16-BIT BUS
TRANSCEIVER WITH
3-STATE OUTPUTS AND
BUS-HOLD
FEATURES:
• ESD > 2000V per MIL-STD-883, Method 3015; > 200V using
machine model (C = 200pF, R = 0)
• 1.8V Optimized
• 0.8V to 2.7V Operating Range
• Inputs/outputs tolerant up to 3.6V
• Output drivers: ±9mA @ V
DD
= 2.3V
• Supports hot insertion
• Available in TSSOP, TVSOP, and VFBGA packages
IDT74AUCH16245
DESCRIPTION:
This 16-bit bus transceiver is built using advanced CMOS technology. The
AUCH16245 is designed specifically for asynchronous communications be-
tween data buses. The control function implementation minimizes external timing
requirements.
This device can be used as one 16-bit transceiver or two 8-bit transceivers.
It allows data transmission from A bus to B bus or from B bus to A bus, depending
on the logic level at the direction-control (DIR) input. The output-enable (OE)
input can be used to disable the device so that the buses are effectively isolated.
This device is fully specified for partial power-down applications using I
OFF
.
The I
OFF
circuitry disables the outputs, preventing damaging current backflow
through the device when it is powered down.
The AUCH16245 is designed with a ±9mA output driver. This driver is
capable of driving a moderate load while maintaining speed performance.
To ensure the high-impedance state during power up or power down,
OE
should be tied to V
DD
through a pull-up resistor; the minimum value of the resistor
is determined by the current-sinking capability of the driver.
The AUCH16245 data I/Os have bus-hold, which retains the last value
whenever the I/O goes to a high impedance. This prevents floating inputs and
eliminates the need for pull-up/pull-down resistors. Control inputs do not have
bus-hold and should not be allowed to float.
APPLICATIONS:
• High performance, low voltage communications systems
• High performance, low voltage computing systems
FUNCTIONAL BLOCK DIAGRAM
1
DIR
1
48
2
DIR
1
OE
24
25
2
OE
1
A
1
47
2
2
A
1
1
B
1
36
13
2
B
1
TO SEVEN OTHER CHANNELS
TO SEVEN OTHER CHANNELS
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
INDUSTRIAL TEMPERATURE RANGE
1
© 2002 Integrated Device Technology, Inc.
OCTOBER 2002
DSC-5966/12
IDT74AUCH16245
1.8V CMOS 16-BIT BUS TRANSCEIVER WITH 3-STATE OUTPUTS AND BUS-HOLD
INDUSTRIAL TEMPERATURE RANGE
PINOUT CONFIGURATION
6
1OE
1A2
1A4
1A6
1A8
2A1
2A3
2A5
2A7
2OE
5
NC
1A1
1A3
1A5
1A7
2A2
2A4
2A6
2A8
NC
4
NC
GND
V
DD
GND
GND
V
DD
GND
NC
3
NC
GND
V
DD
GND
GND
V
DD
GND
NC
2
NC
1B1
1B3
1B5
1B7
2B2
2B4
2B6
2B8
NC
1
1DIR
1B2
1B4
1B6
1B8
2B1
2B3
2B5
2B7
2DIR
A
B
C
D
E
F
G
H
J
K
VFBGA
NOTE:
NC = No Internal Connection
56 BALL VFBGA PACKAGE LAYOUT
A
6
5
4
3
2
1
B
C
D
E
F
G
H
J
K
TOP VIEW
2
IDT74AUCH16245
1.8V CMOS 16-BIT BUS TRANSCEIVER WITH 3-STATE OUTPUTS AND BUS-HOLD
INDUSTRIAL TEMPERATURE RANGE
PIN CONFIGURATION
ABSOLUTE MAXIMUM RATINGS
(1)
Symbol
V
TERM
Description
Terminal Voltage with Respect to GND
(all input and V
DD
terminals)
Terminal Voltage with Respect to GND
(any I/O or Output terminals in high-
impedance or power-off state)
V
TERM
Terminal Voltage with Respect to GND
(any I/O or Output terminals in high or
low state)
T
STG
I
OUT
I
IK
I
OK
I
DD
I
SS
Storage Temperature
Continuous DC Output Current
Continuous Clamp Current
V
I
> V
DD
V
I
< 0
Continuous Clamp Current, V
O
< 0
Continuous Current through
each V
DD
or GND
–65 to +150
±20
+50
–50
–50
±100
mA
mA
°C
mA
mA
–0.5 to +3.6
V
Max
–0.5 to +3.6
–0.5 to +3.6
Unit
V
V
1
DIR
1
B
1
1
B
2
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
1
OE
1
A
1
1
A
2
V
TERM
GND
1
B
3
1
B
4
GND
1
A
3
1
A
4
V
DD
1
B
5
1
B
6
V
DD
1
A
5
1
A
6
GND
1
B
7
1
B
8
2
B
1
2
B
2
GND
1
A
7
1
A
8
2
A
1
2
A
2
NOTE:
1. Stresses greater than those listed under ABSOLUTE MAXIMUM RATINGS may cause
permanent damage to the device. This is a stress rating only and functional operation
of the device at these or any other conditions above those indicated in the operational
sections of this specification is not implied. Exposure to absolute maximum rating
conditions for extended periods may affect reliability.
CAPACITANCE
(T
A
= +25°C, f = 1.0MHz, V
DD
= 2.5V)
Symbol
C
IN
C
I/O
Parameter
Input Capacitance
(1)
(2)
GND
2
B
3
2
B
4
GND
2
A
3
2
A
4
Conditions
V
IN
= 0V
V
IN
= 0V
Typ.
3
8
Max. Unit
pF
pF
I/O Port Capacitance
V
DD
2
B
5
2
B
6
V
DD
2
A
5
2
A
6
NOTES:
1. Applies to the Control Inputs.
2. Applies to ports A and B.
PIN DESCRIPTION
Pin Names
xOE
xDIR
xAx
xBx
Description
3-State Output Enable Inputs (Active Low)
Direction Control Inputs
A Side Inputs or 3-State Outputs
(1)
B Side Inputs or 3-State Outputs
(1)
GND
2
B
7
2
B
8
2
DIR
GND
2
A
7
2
A
8
2
OE
NOTE:
1. These pins have "bus-hold". All other pins are standard outputs, inputs, or I/Os.
TSSOP/ TVSOP
TOP VIEW
FUNCTION TABLE
(EACH 8-BIT SECTION)
(1)
Inputs
xOE
L
L
H
NOTE:
1. H = HIGH Voltage Level
L = LOW Voltage Level
X = Don't Care
Z = High-Impedance
xDIR
L
H
X
Outputs
Bus B Data to Bus A
Bus A Data to Bus B
Z
3
IDT74AUCH16245
1.8V CMOS 16-BIT BUS TRANSCEIVER WITH 3-STATE OUTPUTS AND BUS-HOLD
INDUSTRIAL TEMPERATURE RANGE
RECOMMENDED OPERATING CHARACTERISTICS
(1)
Symbol
V
DD
Parameter
Supply Voltage
V
DD
= 0.8V
V
DD
= 1.1V to 1.3V
V
IH
Input HIGH Voltage Level
V
DD
= 1.4V to 1.6V
V
DD
= 1.65V to 1.95V
V
DD
= 2.3V to 2.7V
V
DD
= 0.8V
V
DD
= 1.1V to 1.3V
V
IL
Input LOW Voltage Level
V
DD
= 1.4V to 1.6V
V
DD
= 1.65V to 1.95V
V
DD
= 2.3V to 2.7V
V
I
V
O
Input Voltage
Output Voltage
Active State
3-State
V
DD
= 0.8V
V
DD
= 1.1V
I
OH
HIGH Level Output Current
V
DD
= 1.4V
V
DD
= 1.65V
V
DD
= 2.3V
V
DD
= 0.8V
V
DD
= 1.1V
I
OL
LOW Level Output Current
V
DD
= 1.4V
V
DD
= 1.65V
V
DD
= 2.3V
∆t/∆v
T
A
Input Transition Rise or Fall Time
Operating Free-Air Temperature
Test Conditions
Min.
0.8
V
DD
0.65 x V
DD
0.65 x V
DD
0.65 x V
DD
1.7
—
—
—
—
—
0
0
0
—
—
—
—
—
—
—
—
—
—
—
–40
Max.
2.7
—
—
—
—
—
0
0.35 x V
DD
0.35 x V
DD
0.35 x V
DD
0.7
2.7
V
DD
2.7
–0.7
–3
–5
–8
–9
0.7
3
5
8
9
5
+85
ns/V
°C
mA
mA
V
V
V
V
Unit
V
NOTE:
1. All unused inputs of the device must be held at V
DD
or GND to ensure proper operation.
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE
(1)
Following Conditions Apply Unless Otherwise Specified:
Operating Conditions: T
A
= –40°C to +85°C
Symbol
I
IH
I
IL
I
OFF
I
OZH
(2)
I
OZL
(2)
I
DDL
I
DDH
I
DDZ
NOTES:
1. All unused inputs of the device must be held at V
DD
or GND to ensure proper operation.
2. For the I/O ports, the parameters I
OZH
and I
OZL
include the input leakage current.
Parameter
Input HIGH or LOW Current Data Inputs
Control Inputs
Input/Output Power Off Leakage
High Impedance Output Current
(3-State Output Pins)
Quiescent Power Supply Current
Test Conditions
V
DD
= 2.7V, V
I
= V
DD
or GND
V
DD =
0V, V
IN or
V
O
≤
2.7V
V
DD
= 2.7V
V
DD
= 0.8V to 2.7V
V
IN
= GND or V
DD
V
O
= V
DD
V
O
= GND
Min.
—
—
—
—
—
—
Typ.
—
—
—
—
—
—
Max.
±10
±5
±10
±10
±10
20
Unit
µA
µA
µA
µA
4
IDT74AUCH16245
1.8V CMOS 16-BIT BUS TRANSCEIVER WITH 3-STATE OUTPUTS AND BUS-HOLD
INDUSTRIAL TEMPERATURE RANGE
BUS-HOLD CHARACTERISTICS
Symbol
Parameter
(1)
V
DD
= 1.1V
I
BHH
I
BHL
V
DD
= 1.65V
V
DD
= 2.3V
V
DD
= 1.3V
I
BHHO
I
BHLO
NOTE:
1. Pins with Bus-hold are identified in the pin description.
Test Conditions
V
I
= 0.8V
V
I
= 0.35V
V
I
= 0.9V
V
I
= 0.47V
V
I
= 1.07V
V
I
= 0.57V
V
I
= 1.7V
V
I
= 0.7V
Min.
–10
10
–15
15
–20
20
–40
40
—
V
I
= 0 to V
DD
—
—
—
Typ.
—
—
—
—
—
—
—
—
—
—
—
—
Max.
—
—
—
—
—
—
—
—
±125
±175
±250
±400
Unit
Bus-Hold Input Sustain Current
V
DD
= 1.4V
µA
Bus-Hold Input Overdrive Current
V
DD
= 1.6V
V
DD
= 1.95V
V
DD
= 2.7V
µA
OUTPUT DRIVE CHARACTERISTICS
Symbol
V
OH
Parameter
Output HIGH Voltage
Test Conditions
(1)
V
DD
= 0.8V - 2.7V
I
OH
= –100µA
I
OH
= –0.7mA
V
DD
= 0.8V
(2)
I
OH
= –3mA
V
DD
= 1.1V
(3)
V
DD
= 1.4V
I
OH
= –5mA
I
OH
= –8mA
V
DD
= 1.65V
(4)
(5)
V
DD
= 2.3V
I
OH
= –9mA
V
DD
= 0.8V - 2.7V
I
OH
= 100µA
I
OL
= 0.7mA
V
DD
= 0.8V
I
OL
= 3mA
V
DD
= 1.1V
(2)
(3)
V
DD
= 1.4V
I
OL
= 5mA
I
OL
= 8mA
V
DD
= 1.65V
(4)
(5)
I
OH
= 9mA
V
DD
= 2.3V
Min.
V
DD
- 0.1
—
0.8
1
1.2
1.8
—
—
—
—
—
—
Typ.
—
0.55
—
—
—
—
—
0.25
—
—
—
—
Max.
—
—
—
—
—
—
0.2
—
0.3
0.4
0.45
0.6
Unit
V
V
OL
Output LOW Voltage
V
NOTES:
1. V
IL
and V
IH
must be within
2. Demonstrates operation for
3. Demonstrates operation for
4. Demonstrates operation for
5. Demonstrates operation for
the min. or max. range shown in the DC ELECTRICAL CHARACTERISTICS table for the appropriate V
DD
range. T
A
= -40°C to +85°C.
nominal V
DD
= 1.2V.
nominal V
DD
= 1.5V.
nominal V
DD
= 1.8V.
nominal V
DD
= 2.5V.
5
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