Philips 74HC245 Technical data

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74HC245; 74HCT245

Octal bus tranceiver; 3-state

Rev. 03 — 31 January 2005 Product data sheet

1. General description

The 74HC245; 74HCT245 is a high-speed Si-gate CMOS device and is pin compatible
with Low-Power Schottky TTL (LSTTL).

The 74HC245; 74HCT245 is an octal transceiver featuring non-inverting 3-state bus
compatible outputs in both send and receive directions. The 74HC245; 74HCT245
features an output enable input (OE) for easy cascading and a send/receive input (DIR)
for direction control. OE controls the outputs so that the buses are effectively isolated.

The 74HC245; 74HCT245 is similar to the 74HC640; 74HCT640 but has true
(non-inverting) outputs.

2. Features

■ Octal bidirectional bus interface

■ Non-inverting 3-state outputs

■ Multiple package options

■ Complies with JEDEC standard no. 7A

■ ESD protection:

◆ HBM EIA/JESD22-A114-B exceeds 2000 V

◆ MM EIA/JESD22-A115-A exceeds 200 V

■ Specified from −40 °Cto+85°C and from −40 °C to +125 °C

3. Quick reference data

Table 1: Quick reference data

GND = 0 V; T

Symbol Parameter Conditions Min Typ Max Unit

Type 74HC245

, t

t

PHL

C

I

C

I/O

C

PD

Type 74HCT245

, t

t

PHL

amb

propagation delay

PLH

An to Bn or Bn to An
input capacitance - 3.5 - pF
input/output capacitance - 10 - pF
power dissipation

capacitance per
transceiver

propagation delay

PLH

An to Bn or Bn to An

=25°C; tr=tf= 6 ns.

CL=15pF;
V

=5V

CC

VI= GND to V

CL=15pF;
V

=5V

CC

CC

-7-ns

[1]

-30-pF

-10-ns

Philips Semiconductors

74HC245; 74HCT245

Octal bus tranceiver; 3-state

Table 1: Quick reference data

GND = 0 V; T

=25°C; tr=tf= 6 ns.

amb

…continued

Symbol Parameter Conditions Min Typ Max Unit

C

I

C

I/O

C

PD

input capacitance - 3.5 - pF
input/output capacitance - 10 - pF
power dissipation

capacitance per

VI= GND to
V

− 1.5 V

CC

[1]

-30-pF

transceiver

[1] CPDis used to determine the dynamic power dissipation (PD in µW):

PD=CPD× V
fi= input frequency in MHz;
fo= output frequency in MHz;
CL= output load capacitance in pF;
VCC= supply voltage in V;
N = number of inputs switching;
∑ (CL× V

2

× fi× N+∑ (CL× V

CC

2

× fo) = sum of outputs.

CC

2

× fo) where:

CC

4. Ordering information

Table 2: Ordering information

Type number Package

Temperature range Name Description Version

74HC245N −40 °C to +125 °C DIP20 plastic dual in-line package; 20 leads (300 mil) SOT146-1
74HC245D −40 °C to +125 °C SO20 plastic small outline package; 20 leads;

body width 7.5 mm

74HC245PW −40 °C to +125 °C TSSOP20 plastic thin shrink small outline package; 20 leads;

body width 4.4 mm

74HC245DB −40 °C to +125 °C SSOP20 plastic shrink small outline package; 20 leads;

body width 5.3 mm

74HC245BQ −40 °C to +125 °C DHVQFN20 plastic dual-in-line compatible thermal enhanced

very thin quad flat packageno leads; 20 terminals;

body 2.5 × 4.5 × 0.85 mm
74HCT245N −40 °C to +125 °C DIP20 plastic dual in-line package; 20 leads (300 mil) SOT146-1
74HCT245D −40 °C to +125 °C SO20 plastic small outline package; 20 leads;

body width 7.5 mm
74HCT245PW −40 °C to +125 °C TSSOP20 plastic thin shrink small outline package; 20 leads;

body width 4.4 mm
74HCT245DB −40 °C to +125 °C SSOP20 plastic shrink small outline package; 20 leads;

body width 5.3 mm
74HCT245BQ −40 °C to +125 °C DHVQFN20 plastic dual-in-line compatible thermal enhanced

very thin quad flat package no leads; 20 terminals;

body 2.5 × 4.5 × 0.85 mm

SOT163-1

SOT360-1

SOT339-1

SOT764-1

SOT163-1

SOT360-1

SOT339-1

SOT764-1

9397 750 14502 © Koninklijke Philips Electronics N.V. 2005. All rights reserved.

Product data sheet Rev. 03 — 31 January 2005 2 of 22

Philips Semiconductors

5. Functional diagram

DIR

1

A0

2

A1

3

A2

4

A3

5

A4

6

A5

7

A6

8

A7

9

OE

B0

B1

B2

B3

B4

B5

B6

B7

mna174

74HC245; 74HCT245

Octal bus tranceiver; 3-state

19

19

18

17

16

15

14

13

12

11

G3

1

3EN1
3EN2

1

2

4
5
6
7
8

2

mna175

18

173
16
15
14
13
12
119

Fig 1. Logic symbol Fig 2. IEC logic symbol

9397 750 14502 © Koninklijke Philips Electronics N.V. 2005. All rights reserved.

Product data sheet Rev. 03 — 31 January 2005 3 of 22

Philips Semiconductors

6. Pinning information

6.1 Pinning

74HC245; 74HCT245

Octal bus tranceiver; 3-state

1

DIR V

2

A0 OE

3

A1 B0

4

A2 B1

5

A3 B2

6

A4 B3

7

A5 B4

8

A6 B5

9

A7 B6

10

GND B7

Fig 3. Pin configuration DIP20, SO20,

SSOP20 and TSSOP20

6.2 Pin description

245

001aac431

terminal 1

index area

2 19

A0 OE

3 18

A1 B0

20

CC

19
18
17
16
15
14
13
12
11

4 17

A2 B1

5 16

A3 B2

6 15

A4 B3

7 14

A5 B4

8 13

A6

9

A7

Transparent top view

DIR
1

245

GND

10

GND

CC

V
20

(1)

11
B7

12

001aac432

B5
B6

(1) The die substrate is attached to this

pad using conductive die attach
material. It can not be used as supply
pin or input

Fig 4. Pin configuration DHVQFN20

Table 3: Pin description

Symbol Pin Description

DIR 1 direction control
A0 2 data input/output
A1 3 data input/output
A2 4 data input/output
A3 5 data input/output
A4 6 data input/output
A5 7 data input/output
A6 8 data input/output
A7 9 data input/output
GND 10 ground (0 V)
B7 11 data input/output
B6 12 data input/output
B5 13 data input/output
B4 14 data input/output
B3 15 data input/output
B2 16 data input/output

9397 750 14502 © Koninklijke Philips Electronics N.V. 2005. All rights reserved.

Product data sheet Rev. 03 — 31 January 2005 4 of 22

Philips Semiconductors

74HC245; 74HCT245

Octal bus tranceiver; 3-state

Table 3: Pin description

Symbol Pin Description

B1 17 data input/output
B0 18 data input/output
OE 19 output enable input (active LOW)
V

CC

7. Functional description

7.1 Function table

Table 4: Function table

Input Input/output
OE DIR An Bn

L L A = B input
L H input B = A
HXZZ

[1] H = HIGH voltage level;

L = LOW voltage level;
X = don’t care;
Z = high-impedance OFF-state.

…continued

20 supply voltage

[1]

8. Limiting values

Table 5: Limiting values

In accordance with the Absolute Maximum Rating System (IEC 60134). Voltages are referenced to
GND (ground = 0 V).

Symbol Parameter Conditions Min Max Unit

V

CC

I

IK

I

OK

I

O

, I

I

CC

T

stg

P

tot

[1] For DIP20 packages: above 70 °C, P

For SO20 packages: above 70 °C, P
For SSOP20 and TSSOP20 packages: above 60 °C, P
For DHVQFN20 packages: above 60 °C, P

supply voltage −0.5 +7 V
input diode current VI < −0.5 V or VI>VCC+ 0.5 V - ±20 mA
output diode current VO< −0.5 V or

output source or sink

V

O>VCC

VO = −0.5 V to VCC+ 0.5 V - ±35 mA

+ 0.5 V

- ±20 mA

current

GNDVCC

or GND current - ±70 mA
storage temperature −65 +150 °C
total power dissipation

[1]

DIP20 package - 750 mW
SO20, SSOP20,

- 500 mW
TSSOP20 and
DHVQFN20 packages

derates linearly with 12 mW/K.

tot

derates linearly with 8 mW/K.

tot

derates linearly with 5.5 mW/K.

tot

derates linearly with 4.5 mW/K.

tot

9397 750 14502 © Koninklijke Philips Electronics N.V. 2005. All rights reserved.

Product data sheet Rev. 03 — 31 January 2005 5 of 22

Philips Semiconductors

9. Recommended operating conditions

Table 6: Recommended operating conditions

Symbol Parameter Conditions Min Typ Max Unit

Type 74HC245

V

CC

V

I

V

O

, t

t

r

f

T

amb

Type 74HCT245

V

CC

V

I

V

O

, t

t

r

f

T

amb

supply voltage 2.0 5.0 6.0 V
input voltage 0 - V
output voltage 0 - V
input rise and fall

times

VCC = 2.0 V - - 1000 ns

= 4.5 V - 6.0 500 ns

V

CC

= 6.0 V - - 400 ns

V

CC

ambient temperature −40 - +125 °C

supply voltage 4.5 5.0 5.5 V
input voltage 0 - V
output voltage 0 - V
input rise and fall

VCC = 4.5 V - 6.0 500 ns

times
ambient temperature −40 - +125 °C

74HC245; 74HCT245

Octal bus tranceiver; 3-state

V

CC

V

CC

V

CC

V

CC

10. Static characteristics

Table 7: Static characteristics type 74HC245

At recommended operating conditions; voltages are referenced to GND (ground = 0 V).

Symbol Parameter Conditions Min Typ Max Unit

=25°C

T

amb

V

IH

V

IL

V

OH

HIGH-level input voltage VCC= 2.0 V 1.5 1.2 - V

= 4.5 V 3.15 2.4 - V

V

CC

= 6.0 V 4.2 3.2 - V

V

CC

LOW-level input voltage VCC= 2.0 V - 0.8 0.5 V

= 4.5 V - 2.1 1.35 V

V

CC

= 6.0 V - 2.8 1.8 V

V

CC

HIGH-level output voltage VI=VIHor V

IL

IO= −20 µA; VCC= 2.0 V 1.9 2.0 - V

= −20 µA; VCC= 4.5 V 4.4 4.5 - V

I

O

= −20 µA; VCC= 6.0 V 5.9 6.0 - V

I

O

= −6.0 mA; VCC= 4.5 V 3.98 4.32 - V

I

O

= −7.8 mA; VCC= 6.0 V 5.48 5.81 - V

I

O

9397 750 14502 © Koninklijke Philips Electronics N.V. 2005. All rights reserved.

Product data sheet Rev. 03 — 31 January 2005 6 of 22

Philips Semiconductors

74HC245; 74HCT245

Octal bus tranceiver; 3-state

Table 7: Static characteristics type 74HC245

…continued

At recommended operating conditions; voltages are referenced to GND (ground = 0 V).

Symbol Parameter Conditions Min Typ Max Unit

V

OL

LOW-level output voltage VI=VIHor V

IL

IO=20µA; VCC= 2.0 V - 0 0.1 V

=20µA; VCC= 4.5 V - 0 0.1 V

I

O

=20µA; VCC= 6.0 V - 0 0.1 V

I

O

= 6.0 mA; VCC= 4.5 V - 0.15 0.26 V

I

O

= 7.8 mA; VCC= 6.0 V - 0.16 0.26 V

I

O

I
I

I

C
C

T

V

V

V

LI
OZ

CC

I
I/O

amb

IH

IL

OH

input leakage current VI=VCCor GND; VCC= 6.0 V - - ±0.1 µA
OFF-state output current VI=VIHor VIL; VO=VCCor GND;

V

= 6.0 V

CC

quiescent supply current VI=VCCor GND; IO=0A;

V

= 6.0 V

CC

--±0.5 µA

- - 8.0 µA

input capacitance - 3.5 - pF
input/output capacitance - 10 - pF

= −40 °C to +85 °C

HIGH-level input voltage VCC= 2.0 V 1.5 - - V

= 4.5 V 3.15 - - V

V

CC

= 6.0 V 4.2 - - V

V

CC

LOW-level input voltage VCC= 2.0 V - - 0.5 V

= 4.5 V - - 1.35 V

V

CC

= 6.0 V - - 1.8 V

V

CC

HIGH-level output voltage VI=VIHor V

IL

IO= −20 µA; VCC= 2.0 V 1.9 - - V

= −20 µA; VCC= 4.5 V 4.4 - - V

I

O

= −20 µA; VCC= 6.0 V 5.9 - - V

I

O

= −6.0 mA; VCC= 4.5 V 3.84 - - V

I

O

= −7.8 mA; VCC= 6.0 V 5.34 - - V

I

O

V

OL

LOW-level output voltage VI=VIHor V

IL

IO=20µA; VCC= 2.0 V - - 0.1 V

=20µA; VCC= 4.5 V - - 0.1 V

I

O

=20µA; VCC= 6.0 V - - 0.1 V

I

O

= 6.0 mA; VCC= 4.5 V - - 0.33 V

I

O

= 7.8 mA; VCC= 6.0 V - - 0.33 V

I

O

I
I

I

T

V

LI
OZ

CC

amb

IH

input leakage current VI=VCCor GND; VCC= 6.0 V - - ±1.0 µA
OFF-state output current VI=VIHor VIL; VO=VCCor GND;

V

= 6.0 V

CC

quiescent supply current VI=VCCor GND; IO=0A;

V

= 6.0 V

CC

--±5.0 µA

--80µA

= −40 °C to +125 °C

HIGH-level input voltage VCC= 2.0 V 1.5 - - V

= 4.5 V 3.15 - - V

V

CC

= 6.0 V 4.2 - - V

V

CC

9397 750 14502 © Koninklijke Philips Electronics N.V. 2005. All rights reserved.

Product data sheet Rev. 03 — 31 January 2005 7 of 22