INDUSTRIAL TEMPERATURE RANGE
IDT74LVC4245A
CMOS OCTAL BUS TRANSCEIVER AND 3.3V TO 5V SHIFTER
1JULY 2000INDUSTRIAL TEMPERATURE RANGE
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
© 2000 Integrated Device Technology, Inc. DSC-4754/1
FEATURES:
• 0.5 MICRON CMOS Technology
•VCCA = 5V ± 0.5V
•VCCB = 2.7V to 3.6V
• CMOS power levels (0.4µµ
µµ
µ W typ. static)
• Rail-to-rail output swing for increased noise margin
• All inputs, outputs, and I/O are 5V tolerant
• Supports hot insertion
• Available in SOIC, SSOP, QSOP, and TSSOP packages
FUNCTIONAL BLOCK DIAGRAM
APPLICATIONS:
• 5V and 3.3V mixed voltage systems
• Data communication and telecommunication systems
DRIVE FEATURES:
• High Output Drivers: ±24mA
• Reduced system switching noise
IDT74LVC4245A
DESCRIPTION:
The LVC4245A is manufactured using advanced dual metal CMOS
technology. This octal noninverting bus transceiver contains two separate
supply rails; B port has VCCB, which is set at 3.3V, and A port has VCCA, which
is set at 5V. This allows for translation from a 3.3V to a 5V environment, and
vice-versa.
This device is ideal for asynchronous communication between two buses
(A and B). The direction control pin (DIR) controls the direction of data flow.
The output enable pin (OE) overrides the direction control and disables both
ports. All inputs are designed with hysteresis for improved noise margin.
The LVC4245A has been designed with a ±24mA output driver. This
driver is capable of driving a moderate to heavy load while maintaining
speed performance.
CMOS OCTAL BUS
TRANSCEIVER AND 3.3V TO 5V
SHIFTER WITH 3-STATE OUT-
PUTS AND 5 VOLT TOLERANT I/O
DIR
A1
A2
A3
A4
A5
A6
A7
A8
B8
B7
B6
B5
B4
B3
B2
B1
OE
2
3
4
5
6
7
8
9
10
14
15
16
17
18
19
20
21
22
5V Port
3.3V Port
INDUSTRIAL TEMPERATURE RANGE
2
IDT74LVC4245A
CMOS OCTAL BUS TRANSCEIVER AND 3.3V TO 5V SHIFTER
PIN CONFIGURATION
SOIC/ SSOP/ QSOP/ TSSOP
TOP VIEW
Pin Names Description
OE Output Enable Input (Active LOW)
DIR Direction Control Input
Ax Port A Inputs or 3-State Outputs
Bx Port B Inputs or 3-State Outputs
PIN DESCRIPTION
2
3
1
A1
20
19
18 B4
B3
B5
B1
B2
15 B7
B8
16
9
GND
10
A8
B6
23
22
24
21
17
DIR
5
6
A6
7
A4
A5
4A2
A3
8
A7
OE
13
14
11
GND 12
VCCB (3.3V)
VCCB (3.3V)
GND
(5V) VCCA
NOTE:
1 . H = HIGH Voltage Level
L = LOW Voltage Level
X = Don’t Care
Inputs
OE DIR Outputs
L L Bus B Data to Bus A
L H Bus A Data to Bus B
H X High Z state
FUNCTION TABLE(1)
NOTES:
1. As applicable to the device type.
2. For A port only.
3. For B port only.
Symbol Parameter(1) Conditions Typ. Max. Unit
CIN Input Capacitance VIN = 0V or VCCA 5—pF
VCCA = Open
CI/O I/O Port Capacitance(2) VOUT = VCCA or GND 11 — pF
VCCA = 5V
CI/O I/O Port Capacitance(3) VIN = VCCB or GND 11 — pF
VCCB = 3.3V
CAPACITANCE (TA = +25°C, F = 1.0MHz)
ABSOLUTE MAXIMUM RATINGS
FOR VCCB OR VCCB(1)
Symbol Description Max Unit
VTERM Terminal Voltage with Respect to GND –0.5 to +6.5 V
TSTG Storage Temperature –65 to +150 °C
IOUT DC Output Current –50 to +50 mA
IIK Continuous Clamp Current, –50 mA
IOK VI < 0 or VO < 0
ICC Continuous Current through each ±10 0 mA
ISS VCC or GND
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.
INDUSTRIAL TEMPERATURE RANGE
IDT74LVC4245A
CMOS OCTAL BUS TRANSCEIVER AND 3.3V TO 5V SHIFTER
3
Symbol Parameter Test Conditions Min. Typ.(2) Max. Unit
VIH Input HIGH Voltage Level VCCA = 4.5V to 5.5V 2 — — V
VIL Input LOW Voltage Level VCCA = 4.5V to 5.5V — — 0 .8 V
IIH Input Leakage Current VCCA = 5.5V VI = 0 to 5.5V — — ±1µA
IIL
IOZH High Impedance Output Current VCCA = 5.5V VO = 0 to 5.5V — — ±5µA
IOZL (3-State Output pins)
VHInput Hysteresis VCCA = 5V — 100 — mV
ICCL Quiescent Power Supply Current VCCA = 5.5V VIN = GND or VCCA —— 80µA
ICCH
ICCZ
∆ICC Quiescent Power Supply Current One input at 3.4V, other inputs at VCCA or GND — — 1. 5 mA
Variation VCCA = 4.5V to 5.5V
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE (A PORT)
Following Conditions Apply Unless Otherwise Specified:
Operating Condition: TA = –40°C to +85°C, VCCA = 5V ± 0.5V(1)
NOTES:
1. VCCB = 2.7V to 3.6V.
2. Typical values are at VCCA = 5V, +25°C ambient.
Symbol Parameter Test Conditions Min. Typ.(2) Max. Unit
VIH Input HIGH Voltage Level VCCB = 2.7V to 3.6V 2 — — V
VIL Input LOW Voltage Level VCCB = 2.7V to 3.6V — — 0 .8 V
IOZH High Impedance Output Current VCCB = 3.6V VO = 0 to VCCB ——±5µA
IOZL (3-State Output pins)
VHInput Hysteresis VCCB = 3.3V — 100 — mV
ICCL Quiescent Power Supply Current VCCB = 3.6V VIN = GND or VCCB —— 50µA
ICCH
ICCZ
∆ICC Quiescent Power Supply Current One input at VCCB - 0.6V, other inputs at VCCB or GND — — 500 µA
Variation VCCB = 2.7V to 3.6V
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE (B PORT)
Following Conditions Apply Unless Otherwise Specified:
Operating Condition: TA = –40°C to +85°C, VCCB = 2.7V to 3.6V(1)
NOTES:
1. VCCA = 5V ± 0.5V.
2. Typical values are at VCCB = 3.3V, +25°C ambient.
INDUSTRIAL TEMPERATURE RANGE
4
IDT74LVC4245A
CMOS OCTAL BUS TRANSCEIVER AND 3.3V TO 5V SHIFTER
NOTE:
1. VIH and VIL must be within the min. or max. range shown in the DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE table for the appropriate VCC range.
TA = – 40°C to + 85°C, VCCB = 2.7V to 3.6V.
OUTPUT DRIVE CHARACTERISTICS, VCCA = 5V ± 0.5V (A PORT)
Symbol Parameter Test Conditions(1) Min. Max. Unit
VOH Output HIGH Voltage VCCA = 4.5V IOH = – 0.1mA 4 .3 — V
(B Port to A Port) VCCA = 5.5V 5 .3 —
VCCA = 4.5V IOH = – 24mA 3 .7 —
VCCA = 5.5V 4 .7 —
VOL Output LOW Voltage VCCA = 4.5V IOL = 0.1mA — 0.2 V
(B Port to A Port) VCCA = 5.5V — 0.2
VCCA = 4.5V IOL = 24mA — 0.55
VCCA = 5.5V — 0.55
NOTE:
1. VIH and VIL must be within the min. or max. range shown in the DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE table for the appropriate VCC range.
TA = – 40°C to + 85°C, VCCA = 5V ± 0.5V.
OUTPUT DRIVE CHARACTERISTICS, VCCB = 2.7V TO 3.6V (B PORT)
Symbol Parameter Test Conditions(1) Min. Max. Unit
VOH Output HIGH Voltage VCCB = 2.7V to 3.6V IOH = – 0.1mA VCC – 0.2 — V
(A Port to B Port) VCCB = 2.7V IOH = – 12mA 2 .2 —
VCCB = 3V 2.4 —
VCCB = 3V IOH = – 24mA 2 —
VOL Output LOW Voltage VCCB = 2.7V to 3.6V IOL = 0.1mA — 0.2 V
(A Port to B Port) VCCB = 2.7V IOL = 12mA — 0.4
VCCB = 3V IOL = 24mA — 0.55
OPERATING CHARACTERISTICS, TA = 25°C
VCCA = 5V, VCCB = 3.3V
Symbol Parameter Test Conditions Typical Unit
CPD Power Dissipation Capacitance per Transceiver Outputs enabled CL = 0pF, f = 10Mhz 39.5 pF
CPD Power Dissipation Capacitance per Transceiver Outputs disabled 5
INDUSTRIAL TEMPERATURE RANGE
IDT74LVC4245A
CMOS OCTAL BUS TRANSCEIVER AND 3.3V TO 5V SHIFTER
5
SWITCHING CHARACTERISTICS(1)
VCCA = 5V ± 0.5V
VCCB = 2.7V to 3.6V
Symbol Parameter Min. Max. Unit
tPLH Propagation Delay 1 6.3 ns
tPHL Ax to Bx 1 6.7
tPLH Propagation Delay 1 6.1 ns
tPHL Bx to Ax 1 5
tPZL Output Enable Time 1 8.8 ns
tPLZ OE to Bx 1 9.8
tPZL Output Enable Time 1 9 ns
tPLZ OE to Ax 1 8.1
tPLZ Output Disable Time 1 7.7 ns
tPHZ OE to Bx 1 7.8
tPLZ Output Disable Time 1 7 ns
tPHZ OE to Ax 1 5.8
NOTE:
1. See TEST CIRCUITS AND WAVEFORMS. TA = – 40°C to + 85°C.
INDUSTRIAL TEMPERATURE RANGE
6
IDT74LVC4245A
CMOS OCTAL BUS TRANSCEIVER AND 3.3V TO 5V SHIFTER
tPLZ
tPZH tPHZ
0V
VOL+0.3V
VOH
tPZL
VOL
VOH-0.3V
1.5V 3V
0V
1.5V
Output
Control
VCC
Output
Wa ve fo rm 1
S1 at 2 X VCC
(see Note B)
Output
Wave fo rm 2
S1 at GND
(see N ote B)
2 x VCC
GND
Open
CL = 50pF
(see No te A)
From Output
Under Test
S1
500Ω
500Ω
1.5V VCC
0V
1.5V
Input
tW
1.5V VCC
0V
1.5V
Input
tPHL
tPLH
Output
VOH
VOL
50% VCC 50% VCC
50% VCC
50% VCC
LOAD CIRCUIT AND VOLTAGE WAVEFORMS
PARAMETER MEASUREMENT INFORMATION (A PORT)
Load Circuit
Voltage Waveforms Pulse Duration
Voltage Waveforms Propagation Delay Times
Noninverting Outputs
Voltage Waveforms Enable and Disable Times
Low- and High-Level Enabling
NOTES:
A. CL includes probe and jig capacitance.
B. Waveform 1 is for an output with internal conditions such that the output is LOW except when disabled by the output control.
Waveform 2 is for an output with internal conditions such that the output is HIGH except when disabled by the output control.
C. All input pulses are supplied by generators having the following characteristics: PRR ≤ 10MHz; Zo = 50Ω; tF ≤ 2.5ns; tR ≤ 2.5ns.
D. The outputs are measured one at a time with one transition per measurement.
TEST CONDITIONS
TEST S1
tPLH / tPHL Open
tPLZ / tPZL 2 x VCC
tPHZ / tPZH GND
INDUSTRIAL TEMPERATURE RANGE
IDT74LVC4245A
CMOS OCTAL BUS TRANSCEIVER AND 3.3V TO 5V SHIFTER
7
tPLZ
tPZH tPHZ
0V
VOL+0.3V
VOH
tPZL
VOL
VOH-0.3V
1.5V 3V
0V
1.5V
Output
Control
3.5V
Output
Wa ve fo rm 1
S1 at 7V
(see Note B)
Output
Wave fo rm 2
S1 at GND
(see N ote B)
7V
GND
Open
CL = 50pF
(see No te A)
From Output
Under Test
S1
500Ω
500Ω
1.5V 3V
0V
1.5V
Input
tW
1.5V 3V
0V
1.5V
Input
tPHL
tPLH
Output
VOH
VOL
1.5V 1.5V
1.5V
1.5V
Load Circuit
Voltage Waveforms Pulse Duration
Voltage Waveforms Propagation Delay Times
Noninverting Outputs
Voltage Waveforms Enable and Disable Times
Low- and High-Level Enabling
LOAD CIRCUIT AND VOLTAGE WAVEFORMS
PARAMETER MEASUREMENT INFORMATION (B PORT)
NOTES:
A. CL includes probe and jig capacitance.
B. Waveform 1 is for an output with internal conditions such that the output is LOW except when disabled by the output control.
Waveform 2 is for an output with internal conditions such that the output is HIGH except when disabled by the output control.
C. All input pulses are supplied by generators having the following characteristics: PRR ≤ 10MHz; Zo = 50Ω; tF ≤ 2.5ns; tR ≤ 2.5ns.
D. The outputs are measured one at a time with one transition per measurement.
TEST CONDITIONS
TEST S1
tPLH / tPHL Open
tPLZ / tPZL 7V
tPHZ / tPZH GND
INDUSTRIAL TEMPERATURE RANGE
8
IDT74LVC4245A
CMOS OCTAL BUS TRANSCEIVER AND 3.3V TO 5V SHIFTER
ORDERING INFORMATION
CORPORATE HEADQUARTERS for SALES: for Tech Support:
2975 Stender Way 800-345-7015 or 408-727-6116 logichelp@idt.com
Santa Clara, CA 95054 fax: 408-492-8674 (408) 654-6459
www.idt.com
IDT XX LVC XXXX XX
PackageDevice Type
Temp. Range
SO
PY
Q
PG
74
Small Outline IC (gull wing )
Shrink Small Outline Package
Quarter Siz e Small Outlin e Package
Thin Shrink Small Outline Pack age
–40°C to +85°C
X
Bus-Hold
4245A
No Bus-hold
Blank
Octal Bus Transceiver and 3.3V to 5V Shifter with 3-State
Outputs, ±24mA
