TC74ACT245,640P/F/FW/FT
2007-05-11
1
TOSHIBA CMOS Digital Integrated Circuit Silicon Monolithic
TC74ACT245P,TC74ACT245F,TC74ACT245FW,TC74ACT245FT
TC74ACT640P,TC74ACT640F,TC74ACT640FW,TC74ACT640FT
Octal Bus Transceiver
TC74ACT245P/F/FW/FT 3-State,
Non-Inverting
TC74ACT640P/F/FW/FT 3-State, Inverting
The TC74ACT245 and 640 are advanced high speed CMOS
OCTAL BUS TRANSCEIVERs fabricated with silicon gate and
double-layer metal wiring C2MOS technology.
They achieve the high speed operation similar to equivalent
Bipolar Schottky TTL while maintaining the CMOS low power
dissipation.
These devices may be used as a level converter for interfacing
TTL or NMOS to High Speed CMOS. The inputs are compatible with
TTL, NMOS and CMOS output voltage levels.
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: tpd = 4.7 ns (typ.) at VCC = 5 V
• Low power dissipation: ICC = 8 μA (max) at Ta = 25°C
• Compatible with TTL outputs
: VIL = 0.8 V (max), VIH = 2.0 V (min)
• Symmetrical output impedance
: |IOH| = IOL = 24 mA (min)
Capability of driving 50 Ω transmission lines.
• Balanced propagation delays: tpLH ∼
−
tpHL
• 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.
Weight
DIP20-P-300-2.54A : 1.30 g (typ.)
SOP20-P-300-1.27A : 0.22 g (typ.)
SOP20-P-300-1.27 : 0.22 g (typ.)
SOL20-P-300-1.27 : 0.46 g (typ.)
TSSOP20-P-0044-0.65A : 0.08 g (typ.)
Note: xxxFW (JEDEC SOP) is not available in
Japan.
TC74ACT245P, TC74ACT640P
TC74ACT245F, TC74ACT640F
TC74ACT245FW, TC74ACT640FW
TC74ACT245FT, TC74ACT640FT
TC74ACT245,640P/F/FW/FT
2007-05-11
2
Pin Assignment
IEC Logic Symbol
VCC
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)
TC74ACT245
DIR VCC
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)
TC74ACT640
DIR
TC74ACT245
(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
TC74ACT640
(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
TC74ACT245,640P/F/FW/FT
2007-05-11
3
Truth Table
Inputs Function Outputs
G DIR A Bus B Bus ACT245 ACT640
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 VCC −0.5 to 7.0 V
DC input voltage VIN −0.5 to VCC + 0.5 V
DC output voltage VOUT −0.5 to VCC + 0.5 V
Input diode current IIK ±20 mA
Output diode current IOK ±50 mA
DC output current IOUT ±50 mA
DC VCC/ground current ICC ±200 mA
Power dissipation PD 500 (DIP) (Note 2)/180 (SOP/TSSOP) mW
Storage temperature Tstg −65 to 150 °C
Note 1: Exceeding any of the absolute maximum ratings, even briefly, lead to deterioration in IC performance or
even destruction.
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 Range (Note)
Characteristics Symbol Rating Unit
Supply voltage VCC 4.5 to 5.5 V
Input voltage VIN 0 to VCC V
Output voltage VOUT 0 to VCC V
Operating temperature Topr −40 to 85 °C
Input rise and fall time dt/dV 0 to 10 ns/V
Note: The operating range is required to ensure the normal operation of the device. Unused inputs and bus inputs
must be tied to either VCC or GND. Please connect both bus inputs and the bus outputs with VCC 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.
TC74ACT245,640P/F/FW/FT
2007-05-11
4
Electrical Characteristics
DC Characteristics
Test Condition Ta = 25°C Ta =
−40 to 85°C
Characteristics Symbol
VCC
(V) Min Typ. Max Min Max
Unit
High-level input
voltage VIH ―
4.5
to
5.5
2.0 ― ― 2.0 ― V
Low-level input
voltage VIL ―
4.5
to
5.5
― ― 0.8 ― 0.8 V
High-level output
voltage VOH
VIN
= VIH or
VIL
IOH = −50 μA
IOH = −24 mA
IOH = −75 mA (Note)
4.5
4.5
5.5
4.4
3.94
―
4.5
―
―
―
―
―
4.4
3.80
3.85
―
―
―
V
Low-level output
voltage VOL
VIN
= VIH or
VIL
IOL = 50 μA
IOL = 24 mA
IOL = 75 mA (Note)
4.5
4.5
5.5
―
―
―
0.0
―
―
0.1
0.36
―
―
―
―
0.1
0.44
1.65
V
3-state output
off-state current IOZ VIN = VIH or VIL
VOUT = VCC or GND 5.5 ― ― ±0.5 ― ±5.0 μA
Input leakage
current IIN VIN = VCC or GND 5.5 ― ― ±0.1 ― ±1.0 μA
ICC VIN = VCC or GND 5.5 ― ― 8.0 ― 80.0 μA
Quiescent supply
current IC Per input: VIN = 3.4 V
Other input: VCC or GND 5.5 ― ― 1.35 ― 1.5 mA
Note: This spec indicates the capability of driving 50 Ω transmission lines.
One output should be tested at a time for a 10 ms maximum duration.
TC74ACT245,640P/F/FW/FT
2007-05-11
5
AC Characteristics (CL = 50 pF, RL = 500 Ω, input: tr = tf = 3 ns)
Test Condition Ta = 25°C Ta =
−40 to 85°C
Characteristics Symbol
V
CC (V) Min Typ. Max Min Max
Unit
Propagation delay
time (Note 2)
tpLH
tpHL
― 5.0 ± 0.5 ― 5.0 8.0 1.0 9.0 ns
Propagation delay
time (Note 3)
tpLH
tpHL
― 5.0 ± 0.5 ― 5.7 8.5 1.0 9.5 ns
Output enable time tpZL
tpZH
― 5.0 ± 0.5 ― 7.3 12.3 1.0 14.0 ns
Output disable time tpLZ
tpHZ
― 5.0 ± 0.5 ― 6.3 9.7 1.0 11.0 ns
Input capacitance CIN DIR, G ― 5 10 ― 10 pF
Bus input capacitance CI/O A
n, Bn ― 13 ― ― ― pF
TC74ACT245 ― 38 ― ― ―
Power dissipation
capacitance
CPD
(Note 1) TC74ACT640 ― 43 ― ― ―
pF
Note 1: CPD is defined as the value of the internal equivalent capacitance which is calculated from the operating
current consumption without load.
Average operating current can be obtained by the equation:
ICC (opr) = CPD·VCC·fIN + ICC/8 (per bit)
Note 2: For TC74ACT245 only
Note 3: For TC74ACT640 only
TC74ACT245,640P/F/FW/FT
2007-05-11
6
Package Dimensions
Weight: 1.30 g (typ.)
TC74ACT245,640P/F/FW/FT
2007-05-11
7
Package Dimensions
Weight: 0.22 g (typ.)
TC74ACT245,640P/F/FW/FT
2007-05-11
8
Package Dimensions
Weight: 0.22 g (typ.)
TC74ACT245,640P/F/FW/FT
2007-05-11
9
Package Dimensions (Note)
Note: This package is not available in Japan.
Weight: 0.46 g (typ.)
TC74ACT245,640P/F/FW/FT
2007-05-11
10
Package Dimensions
Weight: 0.08 g (typ.)
TC74ACT245,640P/F/FW/FT
2007-05-11
11
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