74HC244 PDF даташит
Спецификация 74HC244 изготовлена «NXP Semiconductors» и имеет функцию, называемую «Octal buffer/line driver». |
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Детали детали
Номер произв | 74HC244 |
Описание | Octal buffer/line driver |
Производители | NXP Semiconductors |
логотип |
17 Pages
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74HC244; 74HCT244
Octal buffer/line driver; 3-state
Rev. 5 — 26 February 2016
Product data sheet
1. General description
The 74HC244; 74HCT244 is an 8-bit buffer/line driver with 3-state outputs. The device
can be used as two 4-bit buffers or one 8-bit buffer. The device features two output
enables (1OE and 2OE), each controlling four of the 3-state outputs. A HIGH on nOE
causes the outputs to assume a high-impedance OFF-state. Inputs include clamp diodes
that enable the use of current limiting resistors to interface inputs to voltages in excess of
VCC.
2. Features and benefits
Input levels:
For 74HC244: CMOS level
For 74HCT244: TTL level
Octal bus interface
Non-inverting 3-state outputs
Complies with JEDEC standard no. 7 A
ESD protection:
HBM JESD22-A114F exceeds 2000 V
MM JESD22-A115-A exceeds 200 V
Multiple package options
Specified from 40 C to +85 C and 40 C to +125 C
3. Ordering information
Table 1. Ordering information
Type number
Package
Temperature range Name
Description
Version
74HC244D
74HCT244D
40 C to +125 C SO20
plastic small outline package; 20 leads;
body width 7.5 mm
SOT163-1
74HC244DB
74HCT244DB
40 C to +125 C SSOP20
plastic shrink small outline package; 20 leads;
body width 5.3 mm
SOT339-1
74HC244PW
74HCT244PW
40 C to +125 C TSSOP20 plastic thin shrink small outline package; 20 leads; SOT360-1
body width 4.4 mm
74HC244BQ
74HCT244BQ
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
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NXP Semiconductors
4. Functional diagram
74HC244; 74HCT244
Octal buffer/line driver; 3-state
Fig 1. Functional diagram
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Fig 2. Logic symbol
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Fig 3. IEC logic symbol
74HC_HCT244
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 5 — 26 February 2016
© NXP Semiconductors N.V. 2016. All rights reserved.
2 of 17
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NXP Semiconductors
74HC244; 74HCT244
Octal buffer/line driver; 3-state
5. Pinning information
5.1 Pinning
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Fig 4. Pin configuration SO20, (T)SSOP20
5.2 Pin description
Table 2. Pin description
Symbol
1OE, 2OE
1A0, 1A1, 1A2, 1A3
2Y0, 2Y1, 2Y2, 2Y3
GND
2A0, 2A1, 2A2, 2A3
1Y0, 1Y1, 1Y2, 1Y3
VCC
Pin
1, 19
2, 4, 6, 8
3, 5, 7, 9
10
17, 15, 13, 11
18, 16, 14, 12
20
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(1) This is not a supply pin. The substrate is attached to this
pad using conductive die attach material. There is no
electrical or mechanical requirement to solder this pad.
However, if it is soldered, the solder land should remain
floating or be connected to GND.
Fig 5. Pin configuration DHVQFN20
Description
output enable input (active LOW)
data input
bus output
ground (0 V)
data input
bus output
supply voltage
74HC_HCT244
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 5 — 26 February 2016
© NXP Semiconductors N.V. 2016. All rights reserved.
3 of 17
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