IDT74ALVCH245
3.3V CMOS OCTAL BUS TRANSCEIVER WITH 3-STATE OUTPUTS
INDUSTRIAL TEMPERATURE RANGE
3.3V CMOS
OCTAL BUS TRANSCEIVER
WITH 3-STATE OUTPUTS
AND BUS-HOLD
FEATURES:
–
–
–
–
–
–
–
–
–
0.5 MICRON CMOS Technology
Typical t
SK
(o) (Output Skew) < 250ps
ESD > 2000V per MIL-STD-883, Method 3015;
> 200V using machine model (C = 200pF, R = 0)
V
CC
= 3.3V ±0.3V, Normal Range
V
CC
= 2.7V to 3.6V, Extended Range
V
CC
= 2.5V ±0.2V
CMOS power levels (0.4µ W typ. static)
Rail-to-Rail output swing for increased noise margin
Available in SOIC, SSOP, QSOP, and TSSOP packages
IDT74ALVCH245
DESCRIPTION:
This octal bus transceiver is built using advanced dual metal CMOS
technology. The three-state controls are designed to operate this device
in a single-byte mode. All inputs are designed with hysteresis for improved
noise margin.
The ALVCH245 is designed for asynchronous communication between
data buses. The device transmits data from the A bus to the B bus or from
the B bus to the A bus, depending on the logic level at the direction-control
(DIR) input.
The ALVCH245 has been designed with a ±24mA output driver. This
driver is capable of driving a moderate to heavy load while maintaining
speed performance.
The ALVCH245 has “bus-hold” which retains the inputs’ last state
whenever the input bus goes to a high impedance. This prevents floating
inputs and eliminates the need for pull-up/down resistors.
Drive Features for ALVCH245:
– High Output Drivers: ±24mA
– Suitable for heavy loads
APPLICATIONS:
• 3.3V High Speed Systems
• 3.3V and lower voltage computing systems
FUNCTIONAL BLOCK DIAGRAM
DIR
1
19
OE
A
1
2
18
B
1
TO SEVEN OTHER CHANNELS
INDUSTRIAL TEMPERATURE RANGE
1
c
1999 Integrated Device Technology, Inc.
SEPTEMBER 2000
DSC-4471/-
IDT74ALVCH245
3.3V CMOS OCTAL BUS TRANSCEIVER WITH 3-STATE OUTPUTS
INDUSTRIAL TEMPERATURE RANGE
PIN CONFIGURATION
D IR
A
1
A
2
A
3
A
4
A
5
A
6
A
7
A
8
GND
1
2
3
4
5
6
7
8
9
10
SO20-2
SO20-7
SO20-8
SO20-9
20
19
18
17
16
15
14
13
12
11
V
CC
OE
B
1
B
2
B
3
B
4
B
5
B
6
B
7
B
8
ABSOLUTE MAXIMUM RATINGS
(1)
Symbol
V
TERM(2)
V
TERM(3)
I
OUT
I
IK
I
OK
I
CC
I
SS
T
STG
Description
Terminal Voltage with Respect to GND
Terminal Voltage with Respect to GND
DC Output Current
Continuous Clamp Current,
V
I
< 0 or V
I
>
V
CC
Continuous Clamp Current, V
O
< 0
Continuous Current through each V
CC
or GND
Storage Temperature
Max.
– 0.5 to +4.6
–0.5 to V
CC
+0.5
– 50 to +50
±50
–50
±100
– 65 to +150
Unit
V
V
mA
mA
mA
mA
°C
ALVC Link
NOTES:
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.
2. V
CC
terminals.
3. All terminals except V
CC
.
SSOP/ TVSOP/ TSSOP/ QSOP
TOP VIEW
CAPACITANCE
(T
A
= +25°C, f = 1.0MHz)
Symbol
C
IN
C
OUT
C
I/O
Parameter
(1)
Input Capacitance
Output Capacitance
I/O Port Capacitance
Conditions
V
IN
= 0V
V
OUT
= 0V
V
IN
= 0V
Typ.
5
7
7
Max.
7
9
9
Unit
pF
pF
pF
ALVC Link
NOTE:
1. As applicable to the device type.
PIN DESCRIPTION
Pin Names
OE
DIR
Ax
Bx
Description
3-State Output Enable Input (Active LOW)
Direction-control Input
Side A Inputs or 3-State Outputs
(1)
Side B Inputs or 3-State Outputs
(1)
NOTE:
1. These pins have “Bus-hold”. All other pins are standard inputs,
outputs, or I/Os.
FUNCTION TABLE
Inputs
OE
L
L
H
NOTE:
1. H = HIGH Voltage Level
L = LOW Voltage Level
X = Don’t Care
c 1998 Integrated Device Technology, Inc.
(1)
Operation
DIR
L
H
X
B data to A bus
A data to B bus
Isolation
2
DSC-123456
IDT74ALVCH245
3.3V CMOS OCTAL BUS TRANSCEIVER WITH 3-STATE OUTPUTS
INDUSTRIAL TEMPERATURE RANGE
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE
Following Conditions Apply Unless Otherwise Specified:
Operating Condition: T
A
= –40°C to +85°C
Symbol
V
IH
V
IL
I
IH
I
IL
I
OZH
I
OZL
V
IK
V
H
I
CCL
I
CCH
I
CCZ
∆I
CC
Parameter
Input HIGH Voltage Level
Input LOW Voltage Level
Input HIGH Current
Input LOW Current
High Impedance Output Current
(3-State Output pins)
Clamp Diode Voltage
Input Hysteresis
Quiescent Power Supply Current
V
CC
= 2.3V, I
IN
= –18mA
V
CC
= 3.3V
V
CC
= 3.6V
V
IN
= GND or V
CC
One input at V
CC
– 0.6V,
other inputs at V
CC
or GND
Test Conditions
V
CC
= 2.3V to 2.7V
V
CC
= 2.7V to 3.6V
V
CC
= 2.3V to 2.7 V
V
CC
= 2.7V to 3.6V
V
CC
= 3.6V
V
CC
= 3.6V
V
CC
= 3.6V
V
I
= V
CC
V
I
= GND
V
O
= V
CC
V
O
= GND
Min.
1.7
2
—
—
—
—
—
—
—
—
—
Typ.
(1)
—
—
—
—
—
—
—
—
– 0.7
100
0.1
Max.
—
—
0.7
0.8
±5
±5
± 10
± 10
– 1.2
—
10
µA
µA
V
mV
µA
µA
V
Unit
V
Quiescent Power Supply
Current Variation
—
—
750
µA
ALVC Link
NOTE:
1. Typical values are at V
CC
= 3.3V, +25°C ambient.
BUS-HOLD CHARACTERISTICS
Symbol
I
BHH
I
BHL
I
BHH
I
BHL
I
BHHO
I
BHLO
ALVC Link
Parameter
(1)
Bus-Hold Input Sustain Current
Bus-Hold Input Sustain Current
Bus-Hold Input Overdrive Current
V
CC
= 3.0V
V
CC
= 2.3V
V
CC
= 3.6V
Test Conditions
V
I
= 2.0V
V
I
= 0.8V
V
I
= 1.7V
V
I
= 0.7V
V
I
= 0 to 3.6V
Min.
– 75
75
– 45
45
—
Typ.
(2)
—
—
—
—
—
Max.
—
—
—
—
± 500
Unit
µA
µA
µA
NOTES:
1. Pins with Bus-hold are identified in the pin description.
2. Typical values are at V
CC
= 3.3V, +25°C ambient.
3
IDT74ALVCH245
3.3V CMOS OCTAL BUS TRANSCEIVER WITH 3-STATE OUTPUTS
INDUSTRIAL TEMPERATURE RANGE
OUTPUT DRIVE CHARACTERISTICS
Symbol
V
OH
Parameter
Output HIGH Voltage
V
CC
Test Conditions
(1)
= 2.3V to 3.6V
I
OH
= – 0.1mA
I
OH
= – 6mA
I
OH
= – 12mA
Min.
V
CC
– 0.2
2
1.7
2.2
2.4
I
OH
= – 24mA
I
OL
= 0.1mA
I
OL
= 6mA
I
OL
= 12mA
V
CC
= 2.7V
V
CC
= 3.0V
I
OL
= 12mA
I
OL
= 24mA
2
—
—
—
—
—
Max.
—
—
—
—
—
—
0.2
0.4
0.7
0.4
0.55
ALVC Link
Unit
V
V
CC
= 2.3V
V
CC
= 2.3V
V
CC
= 2.7V
V
CC
= 3.0V
V
CC
= 3.0V
V
OL
Output LOW Voltage
V
CC
= 2.3V to 3.6V
V
CC
= 2.3V
V
NOTE:
1. V
IH
and V
IL
must be within the min. or max. range shown in the DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE table for the
appropriate V
CC
range. T
A
= – 40°C to + 85°C.
OPERATING CHARACTERISTICS, T
A
= 25
o
C
V
CC
= 2.5V ± 0.2V
Symbol
C
PD
C
PD
Parameter
Power Dissipation Capacitance Outputs enabled
Power Dissipation Capacitance Outputs disabled
Test Conditions
C
L
= 0pF, f = 10Mhz
Typical
22
1.5
V
CC
= 3.3V ± 0.3V
Typical
28
4
Unit
pF
pF
SWITCHING CHARACTERISTICS
(1)
V
CC
= 2.5V ± 0.2V
Symbol
t
PLH
t
PHL
t
PZH
t
PZL
t
PZH
t
PZL
t
PHZ
t
PLZ
t
PHZ
t
PLZ
t
SK
(o)
Parameter
Propagation Delay
Ax to Bx or Bx to Ax
Output Enable Time
OE
to Ax or Bx
Output Enable Time
DIR to Ax or Bx
Output Disable Time
OE
to Ax or Bx
Output Disable Time
DIR to Ax or Bx
Output Skew
(2)
Min.
1.5
1.5
1.5
1.5
1.5
—
Max.
7
9.5
9.5
7.5
7.5
—
V
CC
= 2.7V
Min.
1.5
1.5
1.5
1.5
1.5
—
Max.
5.6
6.2
6.2
5
5
—
V
CC
= 3.3V ± 0.3V
Min.
1.5
1.5
1.5
1.5
1.5
—
Max.
5
5.8
5.8
4.8
4.8
500
Unit
ns
ns
ns
ns
ns
ps
NOTES:
1. See test circuits and waveforms. T
A
= – 40°C to + 85°C.
2. Skew between any two outputs of the same package and switching in the same direction.
4
IDT74ALVCH245
3.3V CMOS OCTAL BUS TRANSCEIVER WITH 3-STATE OUTPUTS
INDUSTRIAL TEMPERATURE RANGE
TEST CIRCUITS AND WAVEFORMS
TEST CONDITIONS
PROPAGATION DELAY
Symbol
V
LOAD
V
IH
V
T
V
LZ
V
HZ
C
L
V
CC
(1)
= 3.3V ±0.3V
6
2.7
1.5
300
300
50
V
CC
(1)
= 2.7V
6
2.7
1.5
300
300
50
V
CC
(2)
= 2.5V ±0.2V Unit
2 x Vcc
V
Vcc
V
CC
/ 2
150
150
30
V
V
mV
mV
pF
ALVC Link
SAME PHASE
INPUT TRANSITION
t
PLH
OUTPUT
t
PLH
OPPOSITE PHASE
INPUT TRANSITION
t
PHL
t
PHL
V
IH
V
T
0V
V
OH
V
T
V
OL
V
IH
V
T
0V
A LV C Link
TEST CIRCUITS FOR ALL OUTPUTS
V
CC
500
Ω
Pulse
Generator
(1, 2)
V
LOAD
Open
GND
ENABLE AND DISABLE TIMES
ENABLE
CONTROL
INPUT
t
PZL
OUTPUT
SW ITCH
NORMALLY
CLO SED
LOW
t
PZH
OUTPUT
SW ITCH
NORMALLY
OP EN
HIGH
V
LOAD/2
V
T
t
PHZ
V
T
0V
t
PLZ
DISABLE
V
IH
V
T
0V
V
LOAD/2
V
LZ
V
OL
V
OH
V
HZ
0V
ALV C Link
V
IN
D.U.T.
V
OUT
R
T
500
Ω
C
L
ALVC Link
DEFINITIONS:
C
L
= Load capacitance: includes jig and probe capacitance.
R
T
=
Termination resistance: should be equal to Z
OUT
of the Pulse
Generator.
NOTES:
1. Pulse Generator for All Pulses: Rate
≤
10MHz; t
F
≤
2.5ns; t
R
≤
2.5ns.
2. Pulse Generator for All Pulses: Rate
≤
10MHz; t
F
≤
2ns; t
R
≤
2ns.
SET-UP, HOLD, AND RELEASE TIMES
DATA
INPUT
TIMING
INPUT
ASYNCHRONOUS
CONTROL
SYNCHRONOUS
CONTROL
t
REM
V
IH
V
T
0V
V
IH
V
T
0V
V
IH
V
T
0V
V
IH
V
T
0V
ALVC Link
NOTE:
1. Diagram shown for input Control Enable-LOW and input Control
Disable-HIGH.
SWITCH POSITION
Test
Open Drain
Disable Low
Enable Low
Disable High
Enable High
All Other tests
Switch
V
LOAD
t
S U
t
H
GND
Open
ALVC Link
t
SU
OUTPUT SKEW -
INPUT
t
PLH1
TSK
(x)
t
PHL1
t
H
V
IH
V
T
0V
V
OH
PULSE WIDTH
LOW -HIGH-LOW
PULSE
t
W
HIGH-LOW -HIGH
PULSE
V
T
A LV C Link
OUTPUT 1
t
SK
(x)
t
SK
(x)
V
T
V
OL
V
OH
V
T
OUTPUT 2
t
PLH2
t
PHL2
V
T
V
OL
t
SK
(x)
= t
PLH2
-
t
PLH1
or
t
PHL2
-
t
PHL1
NOTES:
1. For t
SK
(o) OUTPUT1 and OUTPUT2 are any two outputs.
2. For t
SK
(b) OUTPUT1 and OUTPUT2 are in the same bank.
ALVC Link
5
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