74hc245d.txt

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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 
n Octal bidirectional bus interface 
n Non-inverting 3-state outputs 
n Multiple package options 
n Complies with JEDEC standard no. 7A 
n ESD protection: 
u HBM EIA/JESD22-A114-B exceeds 2000 V 
u MM EIA/JESD22-A115-A exceeds 200 V 
n 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; Tamb =25 °C; tr =tf =6 ns. 

Symbol Parameter Conditions Min Typ Max Unit 
Type 74HC245 

tPHL, tPLH propagation delay CL =15pF; -7 -ns 
An to Bn or Bn to An VCC =5V 
CI input capacitance -3.5 -pF 
CI/O input/output capacitance -10 -pF 
CPD power dissipation VI = GND to VCC 
[1] -30 -pF 
capacitance per 
transceiver 
Type 74HCT245 
tPHL, tPLH propagation delay CL =15pF; -10 -ns 
An to Bn or Bn to An VCC =5V 



Philips Semiconductors 74HC245; 74HCT245 


Octal bus tranceiver; 3-state 

Table 1: Quick reference data …continued 

GND = 0 V; Tamb =25 °C; tr =tf =6 ns. 

Symbol Parameter Conditions Min Typ Max Unit 
CI 
CI/O 
CPD 
input capacitance 
input/output capacitance 
power dissipation 
capacitance per 
transceiver 
VI = GND to 
VCC - 1.5 V 
-
-
[1] -
3.5 
10 
30 
-
-
-
pF 
pF 
pF 
[1] CPD is used to determine the dynamic power dissipation (PD in mW): 
PD =CPD ′ VCC2 ′ fi ′ N+ . (CL ′ VCC2 ′ fo) where: 
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 ′ VCC2 ′ fo) = sum of outputs. 
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; SOT163-1 
body width 7.5 mm 
74HC245PW -40 °C to +125 °C TSSOP20 plastic thin shrink small outline package; 20 leads; SOT360-1 
body width 4.4 mm 
74HC245DB -40 °C to +125 °C SSOP20 plastic shrink small outline package; 20 leads; SOT339-1 
body width 5.3 mm 
74HC245BQ -40 °C to +125 °C DHVQFN20 plastic dual-in-line compatible thermal enhanced SOT764-1 
very thin quad flat package no 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; SOT163-1 
body width 7.5 mm 
74HCT245PW -40 °C to +125 °C TSSOP20 plastic thin shrink small outline package; 20 leads; SOT360-1 
body width 4.4 mm 
74HCT245DB -40 °C to +125 °C SSOP20 plastic shrink small outline package; 20 leads; SOT339-1 
body width 5.3 mm 
74HCT245BQ -40 °C to +125 °C DHVQFN20 plastic dual-in-line compatible thermal enhanced SOT764-1 
very thin quad flat package no leads; 20 terminals; 
body 2.5 ′ 4.5 ′ 0.85 mm 

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 74HC245; 74HCT245 

Octal bus tranceiver; 3-state 


5. Functional diagram 
Fig 1. Logic symbol Fig 2. IEC logic symbol 
2 
1 
DIR 
18 
19 
B0 
B1 
B2 
B3 
B4 
B5 
B6 
B7 
3 
17 
4 
16 
5 
15 
6 
14 
7 
13 
8 
12 
9 
A0 
A1 
A2 
A3 
A4 
A5 
A6 
A7 
11 
OE 
mna174 
173 
1 
19 
2 
1 
164 
155 
146 
137 
128 
119 
18 
G3 
3EN1 
3EN2 
2 
mna175 
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 
74HC245; 74HCT245 

Octal bus tranceiver; 3-state 


6. Pinning information 
6.1 Pinning 
245 
GND(1) 
GNDB7 
DIRV CC 
9 12 
8 13 
7 14 
6 15 
5 16 
4 17 
3 18 
2 19 
1011 
120 
terminal 1 
index area 

A0 

OE 

B0 

B1 

B2 

B3 

B4 

B5 

B6 

A1 

DIR 

A0 

A1 

A2 

A3 

A4 

A5 

A6 

A7 

GND 

245 
1 
2 
3 
4 
5 
6 
7 
8 
9 
10 
12 
11 
14 
13 
16 
15 
18 
17 
20 
19 
A2

VCC 

OE 

A3 

B0 

B1 

A4 

A5

B2 

A6

B3 

B4 

A7 

B5 

B6 

B7 

001aac432 

Transparent top view 

(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 

001aac431 

Fig 3. 
Pin configuration DIP20, SO20, 
SSOP20 and TSSOP20 

6.2 Pin description 
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 …continued 

Symbol Pin Description 
B1 
B0 
OE 
VCC 
17 
18 
19 
20 
data input/output 
data input/output 
output enable input (active LOW) 
supply voltage 
7. Functional description 
7.1 Function table 
Table 4: Function table [1] 

Input Input/output 
OE DIR An Bn 

L 
L 
H 
L 
H 
X 
A = B 
input 
Z 
input 
B = A 
Z 
[1] H = HIGH voltage level; 
L = LOW voltage level; 
X = don’t care; 
Z = high-impedance OFF-state. 
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 
VCC supply voltage 
-0.5+7 V 

IIK input diode current VI < -0.5V or VI>VCC+0.5 V -±20 mA 

IOK output diode current VO < -0.5V or -±20 mA
VO >VCC +0.5 
V


IO output source or sink VO = -0.5V to VCC+0.5V -±35 mA 
current 

ICC, IGND VCC or GND current 
-±70 mA 

Tstg storage temperature 
-65 +150 °C 

Ptot total power dissipation 
[1] 

DIP20 package 
-750 mW 

SO20, SSOP20, -500 mW 
TSSOP20 and 
DHVQFN20 packages 

[1] 
For DIP20 packages: above 70 °C, Ptot derates linearly with 12 mW/K. 
For SO20 packages: above 70 °C, Ptot derates linearly with 8 mW/K. 
For SSOP20 and TSSOP20 packages: above 60 °C, Ptot derates linearly with 5.5 mW/K. 
For DHVQFN20 packages: above 60 °C, Ptot derates linearly with 4.5 mW/K. 
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 74HC245; 74HCT245 

Octal bus tranceiver; 3-state 


9. Recommended operating conditions 
Table 6: Recommended operating conditions 
Symbol Parameter Conditions Min Typ Max Unit 
Type 74HC245 

VCC supply voltage 2.0 5.0 6.0 V 
VI input voltage 0 -VCC V 
VO output voltage 0 -VCC V 
tr, tf input rise and fall VCC = 2.0 V --1000 ns 
times VCC = 4.5 V -6.0 500 ns 
VCC = 6.0 V --400 ns 
Tamb ambient temperature -40 -+125 °C 
Type 74HCT245 
VCC supply voltage 4.5 5.0 5.5 V 
VI input voltage 0 -VCC V 
VO output voltage 0 -VCC V 
tr, tf input rise and fall VCC = 4.5 V -6.0 500 ns 
times 
Tamb ambient temperature -40 -+125 °C 

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 
Tamb =25 °C 

VIH HIGH-level input voltage VCC = 2.0 V 1.5 1.2 -V 
VCC = 4.5 V 3.15 2.4 -V 
VCC = 6.0 V 4.2 3.2 -V 
VIL LOW-level input voltage VCC = 2.0 V -0.8 0.5 V 
VCC = 4.5 V -2.1 1.35 V 
VCC = 6.0 V -2.8 1.8 V 
VOH HIGH-level output voltage VI =VIH or VIL 
IO = -20 mA; VCC = 2.0 V 1.9 2.0 -V 
IO = -20 mA; VCC = 4.5 V 4.4 4.5 -V 
IO = -20 mA; VCC = 6.0 V 5.9 6.0 -V 
IO = -6.0 mA; VCC = 4.5 V 3.98 4.32 -V 
IO = -7.8 mA; VCC = 6.0 V 5.48 5.81 -V 

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 
VOL LOW-level output voltage VI =VIH or VIL 
IO =20 mA; VCC = 2.0 V -0 0.1 V 
IO =20 mA; VCC = 4.5 V -0 0.1 V 
IO =20 mA; VCC = 6.0 V -0 0.1 V 
IO = 6.0 mA; VCC = 4.5 V -0.15 0.26 V 
IO = 7.8 mA; VCC = 6.0 V -0.16 0.26 V 
ILI input leakage current VI =VCC or GND; VCC = 6.0 V --±0.1 mA 
IOZ OFF-state output current VI =VIH or VIL; VO =VCC or GND; --±0.5 mA 
VCC = 6.0 V 
ICC quiescent supply current VI =VCC or GND; IO =0A; --8.0 mA 
VCC = 6.0 V 
CI input capacitance -3.5 -pF 
CI/O input/output capacitance -10 -pF 
Tamb = -40 °C to +85 °C 
VIH HIGH-level input voltage VCC = 2.0 V 1.5 --V 
VCC = 4.5 V 3.15 --V 
VCC = 6.0 V 4.2 --V 
VIL LOW-level input voltage VCC = 2.0 V --0.5 V 
VCC = 4.5 V --1.35 V 
VCC = 6.0 V --1.8 V 
VOH HIGH-level output voltage VI =VIH or VIL 
IO = -20 mA; VCC = 2.0 V 1.9 --V 
IO = -20 mA; VCC = 4.5 V 4.4 --V 
IO = -20 mA; VCC = 6.0 V 5.9 --V 
IO = -6.0 mA; VCC = 4.5 V 3.84 --V 
IO = -7.8 mA; VCC = 6.0 V 5.34 --V 
VOL LOW-level output voltage VI =VIH or VIL 
IO =20 mA; VCC = 2.0 V --0.1 V 
IO =20 mA; VCC = 4.5 V --0.1 V 
IO =20 mA; VCC = 6.0 V --0.1 V 
IO = 6.0 mA; VCC = 4.5 V --0.33 V 
IO = 7.8 mA; VCC = 6.0 V --0.33 V 
ILI input leakage current VI =VCC or GND; VCC = 6.0 V --±1.0 mA 
IOZ OFF-state output current VI =VIH or VIL; VO =VCC or GND; --±5.0 mA 
VCC = 6.0 V