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TC74AC640FTEL

P1-P3P4-P6P7-P9
TC74AC245,640P/F/FT
2014-03-01
1
TOSHIBA CMOS Digital Integrated Circuit Silicon Monolithic
TC74AC245P, TC74AC245F, TC74AC245FT
TC74AC640P, TC74AC640F, TC74AC640FT
Octal Bus Transceiver
TC74AC245P/F/FT 3-State, Non-Inverting
TC74AC640P/F/FT 3-State, Inverting
The TC74AC245, 640 are advanced high speed CMOS OCTAL
BUS TRANSCEIVERs fabricated with silicon gate and double-layer
metal wiring C
2
MOS technology.
They achieve the high speed operation similar to equivalent
Bipolar Schottky TTL while maintaining the CMOS low power
dissipation.
They are intended for two-way asynchronous communication
between data busses. The direction of data transmission is
determined by the level of the DIR input.
The enable input (
G ) can be used to disable the device so that
the busses are effectively isolated.
All inputs are equipped with protection circuits against static
discharge or transient excess voltage.
Features (Note 1)(Note 2)
• High speed: t
pd
= 3.9 ns (typ.) at V
CC
= 5 V
• Low power dissipation: I
CC
= 8 μA (max) at Ta = 25°C
• High noise immunity: V
NIH
= V
NIL
= 28% V
CC
(min)
• Symmetrical output impedance:
|I
OH
| = I
OL
= 24 mA (min)
Capability of driving 50 Ω transmission lines.
• Balanced propagation delays: t
pLH
∼
−
t
pHL
• Wide operating voltage range: V
CC
(opr) = 2 V to 5.5 V
• Pin and function compatible with 74F245/640
Note 1: Do not apply a signal to any bus terminal when it is in
the output mode. Damage may result.
Note 2: All floating (high impedance) bus terminals must have their input levels fixed by means of pull up or pull
down resistors.
TC74AC245P, TC74AC640P
TC74AC245F, TC74AC640F
TC74AC245FT, TC74AC640FT
Weight
DIP20-P-300-2.54A : 1.30 g (typ.)
SOP20-P-300-1.27A : 0.22 g (typ.)
TSSOP20-P-0044-0.65A : 0.08 g (typ.)
Start of commercial production
1986-05
TC74AC245,640P/F/FT
2014-03-01
2
Pin Assignment
IEC Logic Symbol
V
CC
16
B2
B3
B4 15
14
13
12
11
20
1
2
3
4
5
6
7
A5
A6
A7
A8
A1
B5
8
B1
19
B6
G
A3
A4
18
9
A2
GND
10
B8
17
B7
(top view)
TC74AC245
DIR V
CC
16
B2
B3
B4 15
14
13
12
11
20
1
2
3
4
5
6
7
A5
A6
A7
A8
A1
B5
8
B1
19
B6
G
A3
A4
18
9
A2
GND
10
B8
17
B7
(top view)
TC74AC640
DIR
TC74AC245
(1)
(19)
(2)
1
A1
3 EN 1 [BA]
G3
DIR
3 EN 2 [AB]
(3)
A2
(4)
A3
(5)
A4
(6)
A5
(7)
A6
(8)
A7
(9)
A8
2
(18)
(17)
(16)
(15)
(14)
(13)
(12)
(11)
B2
B3
B4
B5
B6
B7
B8
B1
G
TC74AC640
(1)
(19)
(2)
1
A1
3 EN 1 [BA]
G3
DIR
3 EN 2 [AB]
(3)
A2
(4)
A3
(5)
A4
(6)
A5
(7)
A6
(8)
A7
(9)
A8
2
(18)
(17)
(16)
(15)
(14)
(13)
(12)
(11)
B2
B3
B4
B5
B6
B7
B8
B1
G
TC74AC245,640P/F/FT
2014-03-01
3
Truth Table
Inputs Function Outputs
G DIR A Bus B Bus AC245 AC640
L L Output Input A = B A = B
L H Input Output B = A B = A
H X Z Z Z
X: Don’t care
Z: High impedance
Absolute Maximum Ratings (Note 1)
Characteristics Symbol Rating Unit
Supply voltage range V
CC
−0.5 to 7.0 V
DC input voltage V
IN
−0.5 to V
CC
+ 0.5 V
DC output voltage V
OUT
−0.5 to V
CC
+ 0.5 V
Input diode current I
IK
±20 mA
Output diode current I
OK
±50 mA
DC output current I
OUT
±50 mA
DC V
CC
/ground current I
CC
±200 mA
Power dissipation P
D
500 (DIP) (Note 2)/180 (SOP/TSSOP) mW
Storage temperature T
stg
−65 to 150 °C
Note 1: Exceeding any of the absolute maximum ratings, even briefly, lead to deterioration in IC performance or
even destruction.
Using continuously under heavy loads (e.g. the application of high temperature/current/voltage and the
significant change in temperature, etc.) may cause this product to decrease in the reliability significantly
even if the operating conditions (i.e. operating temperature/current/voltage, etc.) are within the absolute
maximum ratings and the operating ranges.
Please design the appropriate reliability upon reviewing the Toshiba Semiconductor Reliability Handbook
(“Handling Precautions”/Derating Concept and Methods) and individual reliability data (i.e. reliability test
report and estimated failure rate, etc).
Note 2: 500 mW in the range of Ta = −40°C to 65°C. From Ta = 65°C to 85°C a derating factor of −10 mW/°C
should be applied up to 300 mW.
Operating Ranges
(Note)
Characteristics Symbol Rating Unit
Supply voltage V
CC
2.0 to 5.5 V
Input voltage V
IN
0 to V
CC
V
Output voltage V
OUT
0 to V
CC
V
Operating temperature T
opr
−40 to 85 °C
Input rise and fall time dt/dV
0 to 100 (V
CC
= 3.3 ± 0.3 V)
0 to 20 (V
CC
= 5 ± 0.5 V)
ns/V
Note: The operating ranges are required to ensure the normal operation of the device. Unused inputs and bus
inputs must be tied to either V
CC
or GND. Please connect both bus inputs and the bus outputs with V
CC
or
GND when the I/O of the bus terminal changes by the function. In this case, please note that the output is
not short-circuited.
P1-P3P4-P6P7-P9

TC74AC640FTEL

Mfr. #:
Buy TC74AC640FTEL
Manufacturer:
Toshiba
Description:
Bus Transceivers CMOS Logic IC 3.9ns 24mA 2.0 to 5.5V
Lifecycle:
New from this manufacturer.
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