1PS8699C 10/23/08
Pin Name Description
OE 3-State Output Enable Inputs (Active LOW)
DIR Direction Control Input
Ax Side A Inputs or 3-State Outputs
Bx Side B Inputs or 3-State Outputs
NC NO Internal Connect
GND Ground
VCCA,VCCB Power
(3.3V) VCCA
DIR
A1
A2
A3
A4
A5
A6
A7
A8
GND
GND
VCCB (5V)
NC
OE
B1
B2
B3
B4
B5
B6
B7
B8
GND
24
23
22
21
20
19
18
17
16
15
14
13
1
2
3
4
5
6
7
8
9
10
11
12
Product Description
The PI74LVC3245A is a non-inverting 8-bit Bidirectional Trans-
ceiv er that uses two seperate power supply rails. A-port (VCCA)
is set to operate at 3.3V and B-port (VCCB) is set to operate at 5V.
This allows for translation from a 3.3V to a 5V environment and
vice-versa. This tranceiver is de signed for asyn chro nous two-way
com mu ni ca tion between data buses. The di rec tion control input pin
(DIR) determines the datafl ow from the A bus to the B bus or from
the B bus to the A bus. The output enable (OE) input, when HIGH,
disables both A and B ports by placing them in HIGH Z condi-
tion.
8-Bit Dual Supply Bus Transceiver
with 3-State Outputs
Logic Block Diagram
Product Features
• 2.7V to 3.6V on A-port and 4.5V to 5.5V on B-port
• TTL Compatible Inputs
• Latch-up performance exceeds 200mA Per JESD78
• ESD protection exceeds JESD22
– 2000V Human-Body Model (A114-B)
– 200V Machine Model (A115-A)
• Industrial Temperature: –40°C to +85°C
• Packaging (Pb-free & Green availiable):
– 24-pin 173-mil wide plastic TSSOP (L)
– 24-pin 150-mil wide plastic QSOP (Q)
PI74LVC3245A
B
1
A
1
OE
DIR
B
2
A
2
B
3
A
3
B
4
A
4
B
5
A
5
B
6
A
6
B
7
A
7
B
8
A
8
2
5
3
4
8
6
7
10
9
22
19
21
20
16
18
17
14
15
Truth Table(1)
Note:
1. H = High Signal Level L = Low Signal Level
X = Don’t Care or Irrelevant Z = High Impedance
Product Pin Description
Product Pin Confi guration
Inputs Outputs
OE DIR
L L Bus B Data to Bus A
L H Bus A Data to Bus B
H X Z (Isolation)
08-0291
PI74LVC3245A
8-Bit Dual Supply Bus Transceiver
with 3-State Outputs
2PS8699C 11/10/08
Maximum Ratings
(Above which the useful life may be impaired. For user guide lines, not tested.)
1. This value is limited to 7V maximum.
2. The package thermal impedance is calculated in ac cor dance with
JESD 51.
Notes:
Stresses greater than those list ed under MAXIMUM RATINGS may cause
permanent damage to the de vice. This is a stress rating only and func-
tion al op er a tion of the device at these or any other con di tions above those
in di cat ed in the op er a tion al sec tions of this spec i fi ca tion is not im plied.
Exposure to absolute maximum rating conditions for ex tend ed periods
may affect reliability.
Supply voltage range, VCCA and VCCB ............................ –0.5V to +7V
Input voltage range, VI(1) : I/O ports (A-port) ....–0.5V to VCCA +0.5V
I/O ports (B-port) ........... –0.5V to VCCB+0.5V
Control Pins .................–0.5V to VCCA +0.5V
Input clamp current, IIK (VI <0) ................................................ –50mA
Output clamp current, IOK (VO <0) ........................................... –50mA
Continous Output Current IO ..................................................±50mA
Continous Current through each VCC or GND pin .....................±100mA
Package thermal im ped ance, θJA(2): package L ...................... 84°C/W
package Q ...................... 98°C/W
package S ...................... 79°C/W
Storage Temperature range, Tstg ................................–65°C to 150°C
08-0291
PI74LVC3245A
8-Bit Dual Supply Bus Transceiver
with 3-State Outputs
3PS8699C 11/10/08
Recommended Operating Conditions(1)
Notes:
1. All unused inputs of the device must be held at the associated VCC or GND to ensure proper device operation.
Parameters Description VCCA VCCB Min. Typ. Max. Units
VCCA Supply Voltage 2.7 3.3 3.6
V
VCCB Supply Voltage 4.5 5 5.5
VIHA High-Level Input Voltage VOB ≤ 0.1v or
VOB ≥ VCCB -0.1V
2.7V 5.0V 2
3.6V 5.0V 2
VIHB High-Level Input Voltage VOA ≤ 0.1V or
VOA ≥ VCCA -0.1V
3.3V 4.5V 2
3.3V 5.5V 2
VILA Low-Level Input Voltage VOB ≤ 0.1V or
VOB ≥ VCCB -0.1V
2.7V 5.0V 0.8
3.6V 5.0V 0.8
VILB Low-Level Input Voltage VOA ≤ 0.1V or
VOA ≥ VCCA -0.1V
3.3V 4.5V 0.8
3.3V 5.5V 0.8
VIH High-Level Input Voltage
(Control Pins)
VOA ≤ 0.1V or
VOA ≥ VCCA -0.1V,
VOB ≤ 0.1V or
VOB ≥ VCCB -0.1V
2.7V 4.5V 2
3.6V 5.5V 2
VIL Low-Level Input Voltage
(Control Pins)
VOA ≤ 0.1V or
VOA ≥ VCCA -0.1V,
VOB ≤ 0.1V or
VOB ≥ VCCB -0.1V
2.7V 4.5V 0.8
3.6V 5.5V 0.8
VIA Input Voltage 0 VCCA
VIB Input Voltage 0 VCCB
VOA Output Voltage 0 VCCA
VOB Output Voltage 0 VCCB
IOHA High-Level Output Current 2.7V 4.5V -12
mA
3V 4.5V -24
IOHB High-Level Output Current 3V 4.5V -24
IOLA Low-Level Output Current 2.7V 4.5V 12
3V 4.5V 24
IOLB Low-Level Output Current 3V 4.5V 24
∆t/∆vInput transition Rise or Fall
Rate 10 ns/v
TAOperating Free-Air Temp. -40 85 ºC
08-0291
PI74LVC3245A
8-Bit Dual Supply Bus Transceiver
with 3-State Outputs
4PS8699C 11/10/08
DC Electrical Characteristics (Over the Operating Range, TA = –40°C +85°C)
Notes:
1. For I/O ports, the parameter IOZ in cludes the input leak age current.
2. This is the in crease in supply current for each input that is at one of the spec i fi ed voltage levels, rath er than 0V or the associated VCC.
Parameters Description Test Conditions VCCA VCCB Min. Typ. Max. Units
VOHA Minimum High Level
Output Voltage (Port A)
IOH = –100μA 3V 4.5V 2.9 3
V
IOH = –12mA 2.7V 4.5V 2.2 2.55
3V 4.5V 2.4 2.8
IOH = –24mA 2.7V 4.5V 2 2.4
3V 4.5V 2.25 2.7
VOHB Minimum High Level
Output Voltage (Port B)
IOH = –100μA 3V 4.5V 4.4 4.5
IOH = –24mA 3V 4.5V 3.76 4.21
VOLA Maximum Low Level
Output Voltage (Port A)
IOL = 100μA 3V 4.5V 0.01 0.1
IOL = 12mA 2.7V 4.5V 0.09 0.44
IOL = 24mA 2.7V 4.5V 0.18 0.5
3V 4.5V 0.18 0.44
VOLB Maximum Low Level
Output Voltage (Port B)
IOL = 100μA 3V 4.5V 0.01 0.1
IOL = 24mA 3V 4.5V 0.18 0.44
II Maximum Input Leakage
Current (Control Inputs) VI = VCCA or GND 3.6V 5.5V ±1
μA
IOZ(1)
Maximum 3-State Output
Leakage Current (A or B
ports)
VI = VIL or VIH, OE = VCCA
VO = VCCA/B or GND 3.6V 5.5V ±5
ICCA Quiescent VCCA
Supply Current
B to A, B-Port = VCCB or
GND, IO (A port) = 0 3.6V 5.5V 10
ICCB Quiescent VCCB
Supply Current
A to B, A port = VCCA or
GND, IO (B port) = 0 3.6V 5.5V 10
∆ICC(2)
ICC per input (A port)
One input VI = VCCA –0.6V,
other inputs = VCCA or GND,
OE = GND and DIR = VCCA
3.6V 5.5V 50
uAICC per input (OE)
One input VI = VCCA –0.6V,
other inputs = VCCA or GND,
DIR = VCCA
3.6V 5.5V 50
ICC per input (DIR)
VI = VCCA –0.6V, other
inputs = VCCA or GND, OE
= GND
3.6V 5.5V 50
ICC per input (B Port)
One Input VI = VCCB –2.1V,
other inputs = VCCB or
GND, OE = GND and DIR
= GND
3.6V 5.5V 0.7 1.5 mA
08-0291
PI74LVC3245A
8-Bit Dual Supply Bus Transceiver
with 3-State Outputs
5PS8699C 11/10/08
Parameters From (Input) To (Output)
VCCA = 2.7V to 3.6V, VCCB = 5V ±0.5V
UnitsCL = 50pF, RL = 500Ω
Min. Max.
tPHL A B 1.0 6.3
ns
tPLH 1.0 6.0
tPHL BA 1.0 5.7
tPLH 1.0 6.0
tPZL OE A 1.0 7.8
tPZH 1.0 7.5
tPZL OE B 1.0 7.8
tPZH 1.0 7.6
tPLZ OE A 1.0 7.0
tPHZ 1.0 7.5
tPLZ OE B 1.0 7.0
tPHZ 1.0 7.3
tSK(O) Output-to-Output Skew(1) 1.5
Capacitance (TA = 25°C)
Notes:
1. CPD is defi ned as the value of the internal equivalent capacitance which is derived from dynamic operating current con-
sumption (ICCD) at no output loading and operating at 50% duty cycle, CPD is related to ICCD dynamic operating current
by the ex pres sion: ICCD = (CPD)(VCC)(fIN) +(ICC static)
AC Electrical Characteristics (Over Operating Range, TA = –40°C to +85°C)
Notes:
1. Skew between any two outputs of the same device, switching in the same direction. Parameter guar an teed by design.
Param-
eters Description Test Conditions Typ. Units
CIN Control Input Capacitance VI = VCCA or GND, VCCA = Open, VCCB =Open 2.8
pF
CI/O Input/Output Capacitance
(A or B port) VI/O = VCCA/B or GND, VCCA = 3.3V, VCCB = 5V 9
CPD Power Dissipation
Capacitance (1)
Outputs Enabled VCCA = 3.3V, VCCB = 5V
CL = 0pF, f = 10MHz
22
Outputs Disabled 2.2
08-0291
PI74LVC3245A
8-Bit Dual Supply Bus Transceiver
with 3-State Outputs
6PS8699C 11/10/08
PARAMETER MEASUREMENT INFORMATION FOR A TO B PORT
VCCA =2.7V TO 3.6V and VCCB = 5V ± 0.5V
Load Circuit
Voltage Waveforms
Propagation Delay Times Voltage Waveforms
Enable and Disable Times
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.
• All input impulses are supplied by generators having the following characteristics: PRR ≤ 10 MHz, ZO = 50Ω, tR ≤ 2.5ns, tF ≤ 2.5ns.
• The outputs are measured one at a time with one transition per measurement.
Figure 1. Load Circuit and Voltage Waveforms
500Ω
500Ω
2xVCCB
Open
GND
S1
From Output
Under Test
CL = 50pF
(See Note A)
500Ω
500Ω
50
Input
t
PLH
t
PHL
0V
B-Port
Output
V
OH
V
OL
1.5V 1.5V
2.7V
50% V
CCB 50% V
CCB
t
PZL
Output
Control
0V
1.5V
50% V
CCB
1.5V
t
PLZ
t
PHZ
V
OL
V
CCB
0V
t
PZH
+0.3V
–0.3V
Output
Waveform 1
S1 at 2 x V
CCB
(see Note B)
Output
Waveform 2
S1 at GND
(see Note B)
V
OH
V
OH
V
OL
2.7V
50% V
CCB
Power- Up Considerations
To avoid excessive supply current, bus contention or oscillation during power-up, the following guidelines should be followed:
1. Connect ground fi rst before any supply voltage is applied.
2. Power up VCCA, which is the control side of the device.
3. Ramp OE ahead of or with VCCA to help prevent bus con ten tion
4. Ramp DIR with VCCA if DIR high is needed (A bus to B bus). Otherwise keep DIR Low.
Test S1
tPLH/tPHL Open
tPLZ/tPZL 2 x VCCB
tPHZ/tPZH GND
08-0291
PI74LVC3245A
8-Bit Dual Supply Bus Transceiver
with 3-State Outputs
7PS8699C 11/10/08
PARAMETER MEASUREMENT INFORMATION FOR B TO A PORT
VCCA =2.7V TO 3.6V and VCCB = 5V ± 0.5V
Load Circuit
Voltage Waveforms
Propagation Delay Times Voltage Waveforms
Enable and Disable Times
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.
• All input impulses are supplied by generators having the following characteristics: PRR ≤ 10 MHz, ZO = 50Ω, tR ≤ 2.5ns, tF ≤ 2.5ns.
• The outputs are measured one at a time with one transition per measurement.
Figure 2. Load Circuit and Voltage Waveforms
500Ω
500Ω
6V
Open
GND
S1
From Output
Under Test
CL = 50pF
(See Note A)
500Ω
500Ω
50
B Port
Input
tPLH tPHL
0V
A-Port
Output
VOH
VOL
1.5V 1.5V
3V
1.5V 1.5V
Test S1
tPLH/tPHL Open
tPLZ/tPZL 6V
tPHZ/tPZH GND
08-0291
PI74LVC3245A
8-Bit Dual Supply Bus Transceiver
with 3-State Outputs
8PS8699C 11/10/08
Packaging Mechanical: 24-pin TSSOP (L)
1
.303
.311
.047
1.20
.002
.006
SEATING
PLANE
.0256
BSC
.018
.030
.004
.008
.252
BSC
1
24
.169
.177
0.05
0.15
6.4
0.45
0.75
0.09
0.20
4.3
4.5
7.7
7.9
0.65 0.19
0.30
.007
.012
Max
DESCRIPTION: 24-Pin, 173-Mil Wide, TSSOP
PACKAGE CODE: L
DOCUMENT CONTROL NO.
PD - 1312
REVISION: E
DATE: 03/09/05
Pericom Semiconductor Corporation
3545 N. 1st Street, San Jose, CA 95134
1-800-435-2335 • www.pericom.com
Note:
1. Package Outline Exclusive of Mold Flash and Metal Burr
2. Controlling dimentions in millimeters
3. Ref: JEDEC MO-153F/AD
08-0291
PI74LVC3245A
8-Bit Dual Supply Bus Transceiver
with 3-State Outputs
9PS8699C 11/10/08
Ordering Information
Ordering Code Package Code Package Type
PI74LVC3245ALE L Pb-free & Green, 24-pin, 173-mil wide plastic TSSOP
PI74LVC3245AQE Q Pb-free & Green, 24-pin, 150-mil wide plastic QSOP
Notes:
• Thermal characteristics can be found on the company web site at www.pericom.com/packaging/
• E = Pb-free & Green
• Adding an X suffi x = Tape/Reel
Pericom Semiconductor Corporation • 1-800-435-2336 • www.pericom.com
Packaging Mechanical: 24-pin QSOP (Q)
1
.337
.344
.053
.069
.004
.010
SEATING
PLANE
.025
typical
.007
.010
.228
.244
1
24
.150
.157
X.XX
X.XX DENOTES DIMENSIONS
IN MILLIMETERS
0.635
8.56
8.74
1.35
1.75
5.79
6.20
0.101
0.254
.008
.012 0.203
0.305
3.81
3.99
0.178
0.254
.033
0.84 0.38
.015 x 45˚
Detail A
Detail A
.008
0.20
MIN.
Guage Plane
.010
0.254
.041
1.04
REF
.016
.035
0.41
0.89
0˚-6˚
.008
.013
0.20
0.33
DESCRIPTION: 24-Pin, 150-Mil Wide, QSOP
PACKAGE CODE: Q
DOCUMENT CONTROL NO.
PD - 1203
REVISION: H
DATE: 10/22/07
Note:
1) Controlling dimensions in millimeters
2) Ref: JEDEC MO-137B/AE
3) Dimensions do not include mold flash, protrusions or gate burrs
Pericom Semiconductor Corporation
3545 N. 1st Street, San Jose, CA 95134
1-800-435-2335 • www.pericom.com
07-0475
08-0291