1PS2032G 08/02/05
Description
Pericom Semiconductor’s PI74FCT16245T and PI74FCT162245T
are 16-bit bidirectional transceivers designed for asynchronous two-
way communication between data buses. The direction control
input pin (xDIR) determines the direction of data ow through the
bidirectional transceiver. The Direction and Ouput Enable controls
are designed to operate these devices as either two independent 8-
bit transceivers or one 16-bit transceiver. The output enable (OE)
input, when HIGH, disables both A and B ports by placing them
in Hi-Z condition.
The PI74FCT16245T output buffers are designed with a power off
disable allowing “live insertion” of boards when used as backplane
drivers.
The PI74FCT162245T has ±24mA balanced output drivers. It is
designed with current limiting resistors at its outputs to control the
output edge rate resulting in lower ground bounce and undershoot.
This eliminates the need for external terminating resistors for most
interface applications.
Block Diagram
Features
Common Features
• PI74FCT16245T and PI74FCT162245T are high-speed, low-
power devices with high-current drive
• VCC = 5V ±10%
• Hysteresis on all inputs
• Packaging (Pb-free & Green available):
– 48-pin 240-mil wide plastic TSSOP (A)
– 48-pin 300-mil wide plastic SSOP (V)
PI74FCT16245T Features
• High output drive: IOH = –32mA; IOL = 64mA
• Power off disable outputs permit “live insertion”
• Typical VOLP (Output Ground Bounce)
< 1.0V at VCC = 5V, TA = 25°C
PI74FCT162245T Features
• Balanced output drivers: ±24mA
• Reduced system switching noise
• Typical VOLP (Output Ground Bounce)
< 0.6V at VCC = 5V, TA = 25°C
PI74FCT16245T
PI74FCT162245T
Fast CMOS 16-Bit Bidirectional Transceivers
1B0
1A0
1OE
1DIR
1B1
1A1
1B2
1A2
1B3
1A3
1B4
1A4
1B5
1A5
1B6
1A6
1B7
1A7
2B0
2A0
2OE
2DIR
2B1
2A1
2B2
2A2
2B3
2A3
2B4
2A4
2B5
2A5
2B6
2A6
2B7
2A7
PI74FCT16245T
PI74FCT162245T
Fast CMOS 16-Bit Bidirectional Tranceivers
2PS2032G 08/02/05
Pin Description
Pin Name Description
XOE 3-State Enable Inputs (Active LOW)
XDIR Direction Control Input
XAXSide A Inputs or 3-State Outputs
XBXSide B Inputs or 3-State Outputs
GND Ground
VCC Power
Truth Table
Inputs(1)
Outputs(1)
XOE XDIR
L L Bus B Data to Bus A
L H Bus A Data to Bus B
H X High Z State
Note:
1. H = High Voltage Level, X = Don’t Care,
L = Low Voltage Level, Z = High Impedance
Pin Conguration
1DIR
1B0
1B1
GND
1B2
1B3
VCC
1B4
1B5
GND
1B6
1B7
2B0
2B1
GND
2B2
2B3
VCC
2B4
2B5
GND
2B6
2B7
2DIR
1OE
1A0
1A1
GND
1A2
1A3
VCC
1A4
1A5
GND
1A6
1A7
2A0
2A1
GND
2A2
2A3
VCC
2A4
2A5
GND
2A6
2A7
2OE
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
Storage Temperature ............................................................ –65°C to +150°C
Ambient Temperature with Power Applied............................ –40°C to +85°C
Supply Voltage to Ground Potential (Inputs & VCC Only).....–0.5V to +7.0V
Supply Voltage to Ground Potential (Outputs & D/O Only) ..–0.5V to +7.0V
DC Input Voltage.....................................................................–0.5V to +7.0V
DC Output Current...............................................................................120mA
Power Dissipation ................................................................................... 1.0W
Note:
Stresses greater than those listed under 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 con-
ditions 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.
Maximum Ratings
(Above which the useful life may be impaired. For user guidelines, not tested.)
PI74FCT16245T
PI74FCT162245T
Fast CMOS 16-Bit Bidirectional Tranceivers
3PS2032G 08/02/05
Notes:
1. For Max. or Min. conditions, use appropriate value specied under Electrical Characteristics for the applicable device type.
2. Typical values are at VCC = 5.0V, +25°C ambient and maximum loading.
3. Not more than one output should be shorted at one time. Duration of the test should not exceed one second.
DC Electrical Characteristics (Over the Operating Range, TA = –40°C to +85°C, VCC = 5.0V ±10%)
Param-
eters Description Test Conditions(1) Min. Typ.(2) Max. Units
VIH Input HIGH Voltage Guaranteed Logic HIGH Level 2.0 V
VIL Input LOW Voltage Guaranteed Logic LOW Level 0.8
IIH Input HIGH Current Standard Input, VCC = Max. VIN = VCC 1
µA
Standard I/O, VCC = Max. VIN = VCC 1
IIL Input LOW Current Standard Input, VCC = Min. VIN = GND –1
Standard I/O, VCC = Min. VIN = GND –1
IOZH High Impedance VCC = Max. VOUT = 2.7V 1
IOZL Output Current VCC = Max. VOUT = 0.5V –1
VIK Clamp Diode Voltage VCC = Min., IIN = –18mA –0.7 –1.2 V
IOS Short Circuit Current VCC = Max.(3), VOUT = GND –80 –140 –300 mA
IOOutput Drive Current VCC = Max.(3), VOUT = 2.5V –50 –180
VHInput Hysteresis 100 mV
PI74FCT16245T Output Drive Characteristics (Over the Operating Range)
Parameters Description Test Conditions(1) Min. Typ.(2) Max. Units
VOH Output HIGH Voltage VCC = Min., VIN = VIH or VIL
IOH = –3.0mA 2.5 3.5
V
IOH = –15.0mA 2.4 3.5
IOH = –32.0mA
VOL Output LOW Voltage VCC = Min., VIN = VIH or VIL IOL = 64mA 0.2 0.55
IOFF Power Down Disable VCC = 0V, VIN or VOUT ≤ 4.5V — — ±100 µA
PI74FCT162245T Output Drive Characteristics (Over the Operating Range)
Parameters Description Test Conditions(1) Min. Typ.(2) Max. Units
VOH Output HIGH Voltage VCC = Min., VIN = VIH or VIL IOH = –24.0mA 2.4 3.3 V
VOL Output LOW Voltage VCC = Min., VIN = VIH or VIL IOL = 24mA 0.3 0.55
IODL Output LOW Current VCC = 5V, VIN = VIH or VIL, VOUT = 1.5V(3) 60 115 160 mA
IODH Output HIGH Current VCC = 5V, VIN = VIH or VIL, VOUT = 1.5V(3) –60 –115 –150
PI74FCT16245T
PI74FCT162245T
Fast CMOS 16-Bit Bidirectional Tranceivers
4PS2032G 08/02/05
Notes:
1. For Max. or Min. conditions, use appropriate value specied under Electrical Characteristics for the applicable device type.
2. Typical values are at VCC = 5.0V, +25°C ambient and maximum loading.
3. Not more than one output should be shorted at one time. Duration of the test should not exceed one second.
4. This parameter is determined by device characterization but is not production tested.
Capacitance (TA = 25°C, f = 1 MHz)
Parameters(4) Description Test Conditions Typ. Max. Units
CIN Input Capacitance VIN = 0V 4.5 6 pF
COUT Output Capacitance VOUT = 0V 5.5 8
Power Supply Characteristics
Parameters Description Test Conditions(1) Min. Typ.(2) Max. Units
ICC Quiescent Power
Supply Current VCC = Max. VIN = GND or
VCC 0.1 500 µA
ΔICC Supply Current per
Input @ TTL HIGH VCC = Max. VIN = 3.4V(3) 0.5 1.5 mA
ICCD Supply Current per
Input per MHz(4)
VCC = Max.,
Outputs Open
XOE = xDIR = GND
One Bit Toggling
50% Duty Cycle
VIN = VCC,
VIN = GND 60 100 µA/
MHz
ICTotal Power Supply
Current(6)
VCC = Max.,
Outputs Open
fI = 10 MHZ
50% Duty Cycle
XOE = xDIR = GND
One Bit Toggling
VIN = VCC,
VIN = GND 0.7 2.5(5)
mA
VIN = 3.4V 0.9 3.3(5)
VCC = Max.,
Outputs Open
fI = 2.5 MHZ
50% Duty Cycle
XOE = xDIR = GND
16 Bits Toggling
VIN = VCC,
VIN = GND 2.5 5.5(5)
VIN = 3.4V 6.5 17.5(5)
Notes:
1. For Max. or Min. conditions, use appropriate value specied under Electrical Characteristics for the applicable device.
2. Typical values are at VCC = 5.0V, +25°C ambient.
3. Per TTL driven input (VIN = 3.4V); all other inputs at VCC or GND.
4. This parameter is not directly testable, but is derived for use in Total Power Supply Calculations.
5. Values for these conditions are examples of the ICC formula. These limits are guaranteed but not tested.
6. IC =IQUIESCENT + IINPUTS + IDYNAMIC
IC = ICC + ΔICC DHNT + ICCD (fCP/2 + fINI)
ICC = Quiescent Current
ΔICC = Power Supply Current for a TTL High Input (VIN = 3.4V)
DH = Duty Cycle for TTL Inputs High
NT = Number of TTL Inputs at DH
ICCD = Dynamic Current Caused by an Input Transition Pair (HLH or LHL)
fCP = Clock Frequency for Register Devices (Zero for Non-Register Devices)
fI = Input Frequency
NI = Number of Inputs at fI
All currents are in milliamps and all frequencies are in megahertz.
PI74FCT16245T
PI74FCT162245T
Fast CMOS 16-Bit Bidirectional Tranceivers
5PS2032G 08/02/05
Notes:
1. See test circuit and waveforms.
2. Minimum limits are guaranteed but not tested on Propagation Delays.
3. This parameter is guaranteed but not production tested.
4. Skew between any two outputs, of the same package, switching in the same direction.
This parameter is guaranteed by design.
PI74FCT16245T Switching Characteristics over Operating Range
Parameters Description Conditions(1)
16245T 16245AT 16245CT
UnitsCom. Com. Com.
Min. Max. Min. Max. Min. Max.
tPHL
tPHL
Propagation Delay(2)
A TO B, B TO A
CL = 50pF
RL = 500Ω
1.5 7.0 1.5 4.6 1.5 4.1 ns
tPZH
tPZL
Output Enable Time
XOE to A OR B 1.5 9.5 1.5 6.2 1.5 5.8 ns
tPHZ
tPLZ
Output Disable Time(3)
XOE to A OR B 1.5 7.5 1.5 5.0 1.5 4.8 ns
tPZH
tPZL
Output Enable Time
XDIR to A OR B(3) 1.5 9.5 1.5 6.2 1.5 5.8 ns
tPHZ
tPLZ
Output Disable Time
XDIR to A OR B(3) 1.5 7.5 1.5 5.0 1.5 4.8 ns
TSK(O)Output Skew(4) — 0.5 — 0.5 — 0.5 ns
PI74FCT162245T Switching Characteristics over Operating Range
Parameters Description Conditions(1)
162245T 162245AT 162245CT
Units
Com. Com. Com.
Min. Max. Min. Max. Min. Max.
tPHL
tPHL
Propagation Delay(2)
A to B, B to A
CL = 50pF
RL = 500Ω
1.5 7.0 1.5 4.6 1.5 4.1 ns
tPZH
tPZL
Output Enable Time
xOE to A or B 1.5 9.5 1.5 6.2 1.5 5.8 ns
tPHZ
tPLZ
Output Disable Time(3)
xOE to A or B 1.5 7.5 1.5 5.0 1.5 4.8 ns
tPZH
tPZL
Output Enable Time
xDIR to A or B(3) 1.5 9.5 1.5 6.2 1.5 5.8 ns
tPHZ
tPLZ
Output Disable Time
xDIR to A or B(3) 1.5 7.5 1.5 5.0 1.5 4.8 ns
tsk(o) Output Skew(4) — 0.5 — 0.5 — 0.5 ns
PI74FCT16245T
PI74FCT162245T
Fast CMOS 16-Bit Bidirectional Tranceivers
6PS2032G 08/02/05
.236
.244
.488
.496
.002
.006
SEATING PLANE
.007
.010
.0197
BSC
.004
.008
.319
1
48
12.4
12.6
6.0
6.2
0.50 0.17
0.27
8.1
0.05
0.15
0.09
0.20
X.XX
X.XX
DENOTES DIMENSIONS
IN MILLIMETERS
.018
.030
0.45
0.75
.047
1.20 Max
BSC
0.20
0.51
1.01
0.25
0.381
0.635
.008
.008
.016
0-8˚
0.20
0.40
.110 2.79
.010
Gauge Plane
.02
.04
.015
.025 x 45˚
.025 BSC
0.635
.291
.299
X.XX
X.XX
DENOTES DIMENSIONS
IN MILLIMETERS
7.39
7.59
.395
.420
10.03
10.67
.620
.630
15.75
16.00
.008
.0135
0.20
0.34
1
48
Nom.
Max
Packaging Mechanical: 48-pin 300-mil wide plastic SSOP (V)
Packaging Mechanical: 48-Pin, 240-mil wide Plastic TSSOP (A)
PI74FCT16245T
PI74FCT162245T
Fast CMOS 16-Bit Bidirectional Tranceivers
7PS2032G 08/02/05
Pericom Semiconductor Corporation • 1-800-435-2336 • www.pericom.com
PI74FCT162245T Ordering Information
Ordering Code Package Code Speed Grade Package Description
PI74FCT162245TA A Blank 48-pin 240-mil wide plastic TSSOP
PI74FCT162245TAE A Blank Pb-free & Green, 48-pin 240-mil wide plastic TSSOP
PI74FCT162245TV V Blank 48-pin 300-mil wide plastic SSOP
PI74FCT162245TVE V Blank Pb-free & Green, 48-pin 300-mil wide plastic SSOP
PI74FCT162245ATA A A 48-pin 240-mil wide plastic TSSOP
PI74FCT162245ATAE A A Pb-free & Green, 48-pin 240-mil wide plastic TSSOP
PI74FCT162245ATV V A 48-pin 300-mil wide plastic SSOP
PI74FCT162245ATVE V A Pb-free & Green, 48-pin 300-mil wide plastic SSOP
PI74FCT162245CTA A C 48-pin 240-mil wide plastic TSSOP
PI74FCT162245CTAE A C Pb-free & Green, 48-pin 240-mil wide plastic TSSOP
PI74FCT162245CTV V C 48-pin 300-mil wide plastic SSOP
PI74FCT162245CTVE V C Pb-free & Green, 48-pin 300-mil wide plastic SSOP
Notes:
1. Thermal characteristics can be found on the company web site at www.pericom.com/packaging/
PI74FCT16245T Ordering Information
Ordering Code Package Code Speed Grade Package Description
PI74FCT16245TA A Blank 48-pin 240-mil wide plastic TSSOP
PI74FCT16245TAE A Blank Pb-free & Green, 48-pin 240-mil wide plastic TSSOP
PI74FCT16245TV V Blank 48-pin 300-mil wide plastic SSOP
PI74FCT16245TVE V Blank Pb-free & Green, 48-pin 300-mil wide plastic SSOP
PI74FCT16245ATA A A 48-pin 240-mil wide plastic TSSOP
PI74FCT16245ATAE A A Pb-free & Green, 48-pin 240-mil wide plastic TSSOP
PI74FCT16245ATV V A 48-pin 300-mil wide plastic SSOP
PI74FCT16245ATVE V A Pb-free & Green, 48-pin 300-mil wide plastic SSOP
PI74FCT16245CTA A C 48-pin 240-mil wide plastic TSSOP
PI74FCT16245CTAE A C Pb-free & Green, 48-pin 240-mil wide plastic TSSOP
PI74FCT16245CTV V C 48-pin 300-mil wide plastic SSOP
PI74FCT16245CTVE V C Pb-free & Green, 48-pin 300-mil wide plastic SSOP