21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PI74FCT245T
Ω
PI74FCT2245T (25Ω Series)
Fast CMOS Octal Bidirectional Transceivers
Features
• Pin compatible with bipolar FAST™ Series at a higher speed
and lower power consumption
• 25-ohm series resistor on all outputs (FCT2245Tonly)
• TTL input and output levels
• Low ground bounce outputs
• Extremely low static power
• Hysteresis on all inputs
• Industrial operating temperature range: –40°C to +85°C
• Packaging (Pb-free & Green Available):
– 20-pin 173-mil wide plastic TSSOP (L)
– 20-pin 300-mil wide plastic SOIC (S)
– 20-pin 209-mil wide plastic SSOP (H)
– 20-pin 150-mil wide plastic QSOP (Q)
Description
Pericom Semiconductor’s PI74FCT245T and PI74FCT2245T are
8-bit wide octal buffer bidirectional transceivers designed for
asynchronous two-way communication between data buses. The
transmit/receive (T/R) input determines the direction of data flow
through the bidirectional transceiver. Transmit (active HIGH) enables
data from A ports to B ports, and receive (active LOW) from B ports
to A ports. The output enable (OE) input, when HIGH, disables both
A and B ports by placing them in Hi-Z condition.
PI74FCT2245T has a built-in 25-ohm series resistor on all outputs to
reduce noise because of reflections, thus eliminating the need for an
external terminating resistor.
Pin Configuration
T/R
A
0
A
1
A
2
A
3
A
4
A
5
A
6
A
7
GND
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
Block Diagram
T/R
OE
A0
B0
A1
B1
A2
B2
A3
B3
A4
B4
A5
B5
A6
B6
A7
B7
1.
Vcc
OE
B
0
B
1
B
2
B
3
B
4
B
5
B
6
B
7
Pin Description
Pin Name
OE
T/R
A
0
-A
7
B
0
-B
7
GND
V
CC
Description
3-State Output Enable Inputs (Active LOW)
Transmit/Receive Input
Side A Inputs or 3-State Outputs
Side B Inputs or 3-State Outputs
Ground
Power
Truth Table
(1)
Inputs
OE
T/R
L
L
L
H
H
X
Outputs
Bus B Data to Bus A
Bus A Data to Bus B
High Z State
H = High Voltage Level, X = Don't Care, L = Low
Voltage Level, Z = High Impedance
06-0207
1
PS2012E
08/08/06
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PI74FCT245T
PI74FCT2245T(25 Ohm Series )
Octal BidirectionalTransceivers
Maximum Ratings
(Above which the useful life may be impaired. For user guidelines, not tested.)
Storage Temperature .................................................................... –65°C to +150°C
Ambient Temperature with Power Applied .................................... –40°C to +85°C
Supply Voltage to Ground Potential (Inputs & V
CC
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 ..........................................................................................0.5W
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 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.
DC Electrical Characteristics
(Over the Operating Range, T
A
= –40°C to +85°C, V
CC
= 5.0V ±5%)
Parameters Description
V
OH
V
OL
V
OL
V
IH
V
IL
I
IH
I
IL
I
IH
I
IL
I
OZH
I
OZL
V
IK
I
OFF
I
OS
V
H
Output HIGH Voltage
Output LOW Current
Output LOW Current
Input HIGH Voltage
Input LOW Voltage
Input HIGH Current
Input LOW Current
Input HIGH Current
Input LOW Current
High Impedance
Output Current
Clamp Diode Voltage
Power Down Disable
Short Circuit Current
Input Hysteresis
V
CC
= Min., I
IN
= –18 mA
V
CC
= GND, V
OUT
= 4.5V
V
CC
= Max.
(3)
, V
OUT
= GND
–60
–120
200
Test Conditions
(1)
V
CC
= Min., V
IN
= V
IH
or V
IL
V
CC
= Min., V
IN
= V
IH
or V
IL
V
CC
= Min., V
IN
= V
IH
or V
IL
Guaranteed Logic HIGH Level
Guaranteed Logic LOW Level
(Except I/O pins) V
CC
= Max.
(Except I/O pins) V
CC
= Max.
(I/O pins Only) V
CC
= Max.
(I/O pins Only) V
CC
= Max.
V
CC
= M
AX
.
V
IN
= V
CC
V
IN
= GND
V
IN
= V
CC
V
IN
= GND
V
OUT
= 2.7V
V
OUT
= 0.5V
–0.7
I
OH
= –15.0mA
I
OL
= 64mA
I
OL
= 12mA (25Ω Series)
2.0
0.8
1
–1
1
–1
1
–1
–1.2
100
Min. Typ
(2)
Max. Units
2.4
3.0
0.3
0.3
0.55
0.50
V
V
V
V
V
μA
μA
μA
μA
μA
μA
V
μA
mA
m
V
Notes:
1. For Max. or Min. conditions, use appropriate value specified under Electrical Characteristics for the applicable device type.
2. Typical values are at V
CC
= 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.
Capacitance
(T
A
= 25°C, f = 1 MHz)
Parameters
(1)
C
IN
C
OUT
Description
Input Capacitance
Output Capacitance
Test Conditions
V
IN
= 0V
V
OUT
= 0V
Typ.
6
8
Max.
10
12
Units
pF
pF
Notes:
1. These Parameters are determined by device characterization but are not production tested.
06-0207
2
PS2012E
08/08/06
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PI74FCT245T
PI74FCT2245T(25 Ohm Series )
Octal BidirectionalTransceivers
Power Supply Characteristics
Parameters Description
I
CC
ΔI
CC
I
CCD
Quiescent Power
Supply Current
Supply Current per
Input @ TTL HIGH
Supply Current per
Input per MHz
(4)
V
CC
= Max.
V
CC
= Max.,
V
CC
= Max.,
Outputs Open
OE = GND
T/R = GND or V
CC
One Input Toggling
50% Duty Cycle
V
CC
= Max.,
Outputs Open
f
I
= 10 MH
Z
50% Duty Cycle
T/R = OE = GND
One Bit Toggling
V
CC
= Max.,
Outputs Open
f
I
= 2.5 MH
Z
50% Duty Cycle
T/R = OE = GND
Eight Bits Toggling
Test Conditions
(1)
V
IN
= GND or V
CC
V
IN
= 3.4V
(3)
V
IN
= V
CC
V
IN
= GND
Min.
Typ
(2)
0.1
0.5
0.15
Max.
500
2.0
0.25
Units
μA
mA
mA/
MHz
I
C
Total Power Supply
Current
(6)
V
IN
= V
CC
V
IN
= GND
V
IN
= 3.4V
V
IN
= GND
V
IN
= V
CC
V
IN
= GND
V
IN
= 3.4V
V
IN
= GND
1.5
1.8
3.5
(5)
4.5
(5)
mA
3.0
5.0
6.0
(5)
14.0
(5)
Notes:
1. For Max. or Min. conditions, use appropriate value specified under Electrical Characteristics for the applicable device.
2. Typical values are at V
CC
= 5.0V, +25°C ambient.
3. Per TTL driven input (V
IN
= 3.4V); all other inputs at V
CC
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. I
C
=I
QUIESCENT
+ I
INPUTS
+ I
DYNAMIC
I
C
= I
CC
+ DI
CC
D
H
N
T
+ I
CCD
(f
CP
/2 + f
I
N
I
)
I
CC
= Quiescent Current
ΔI
CC
= Power Supply Current for a TTL High Input (V
IN
= 3.4V)
D
H
= Duty Cycle for TTL Inputs High
N
T
= Number of TTL Inputs at D
H
I
CCD
= Dynamic Current Caused by an Input Transition Pair (HLH or LHL)
f
CP
= Clock Frequency for Register Devices (Zero for Non-Register Devices)
f
I
= Input Frequency
N
I
= Number of Inputs at f
I
All currents are in milliamps and all frequencies are in megahertz.
06-0207
3
PS2012E
08/08/06
Packaging Mechanical: 20-pin SOIC (S)
20
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PI74FCT245T
PI74FCT2245T(25 Ohm Series )
Octal BidirectionalTransceivers
Switching Characteristics over Operating Range
245T/2245T
Com.
Min.
Max.
1.5
(1)
1.5
1.5
1.5
1.5
7.0
9.0
7.5
9.0
7.5
245AT/2245AT 245CT/2245CT
Com.
Com.
Min.
Max.
Min.
Max.
1.5
(1)
1.5
1.5
1.5
1.5
4.6
6.2
5.0
6.2
5.0
1.5
(1)
1.5
1.5
1.5
1.5
4.1
5.8
4.8
5.8
4.8
245DT
Com.
Min
Max. Unit
1.5
(1)
1.5
1.5
1.5
1.5
3.8
5.0
4.3
5.0
4.3
ns
ns
ns
ns
ns
Parameters Description
t
PLH
t
PHL
t
PZH
t
PZL
t
PHZ
t
PLZ
t
PZH
t
PZL
t
PHZ
t
PLZ
Propagation Delay
A to B, B to A
Output Enable Time
(2)
OE to A or B
Output Disable Time
(2)
OE to A or B
Output Enable Time
(2)
T/R to A or B
Output Disable Time
(2)
T/R to A or B
Conditions
(1)
C
L
= 50 pF
R
L
= 500-ohm
Notes:
1. Minimum limits are guaranteed but not tested on Propagation Delays.
2. This parameter is guaranteed but not production tested.
.2914
.2992
7.40
7.60
.010
.029
0.254
x 45˚
0.737
1
.496 12.60
.511 12.99
.0091
.0125
0.41 .016
1.27 .050
.0926
.1043
2.35
2.65
SEATING
PLANE
.394
.419
10.00
10.65
0.23
0.32
0-8˚
.020 0.508
REF
.030 0.762
.050
BSC
1.27
.013
.020
0.33
0.51
.0040
.0118
0.10
0.30
X.XX DENOTES CONTROLLING
X.XX DIMENSIONS IN MILLIMETERS
06-0207
4
PS2012E
08/08/06
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PI74FCT245T
PI74FCT2245T(25 Ohm Series )
Octal BidirectionalTransceivers
Packaging Mechanical: 20-Pin TSSOP (L)
20
.169
.177
4.3
4.5
1
.252
.260
6.4
6.6
.004 0.09
.008 0.20
.047
1.20
Max
0.45
0.75
.018
.030
SEATING
PLANE
.238
.269
6.1
6.7
.0256
BSC
0.65
.007
.012
0.19
0.30
.002 0.05
.006 0.15
Packaging Mechanical: 20-pin QSOP (Q)
20
.008
0.20
MIN.
.150
.157
3.81
3.99
Guage Plane
.008
.013
0.20
0.33
.010
0.254
1
.337 8.56
.344 8.74
Detail A
.016
.035
0.41
0.89
.041
1.04
REF
0˚-6˚
.058
REF
1.47
.053 1.35
.069 1.75
SEATING
PLANE
.015 x 45˚
0.38
Detail A
.007
.010
.016
.050
0.41
1.27
0.178
0.254
.025
BSC
0.635
.004 0.101
.010 0.254
.008 0.203
.012 0.305
.228
.244
5.79
6.19
X.XX DENOTES DIMENSIONS
X.XX IN MILLIMETERS
06-0207
5
PS2012E
08/08/06
京公网安备 11010802033920号
EEWORLD
