Service Manuals, User Guides, Schematic Diagrams or docs for : Keithley 2001 ds Digital 74HC_HCT244
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74HC244; 74HCT244
Octal buffer/line driver; 3-state
Rev. 4 -- 24 September 2012 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
74HC244N 40 C to +125 C DIP20 plastic dual in-line package; 20 leads (300 mil) SOT146-1
74HCT244N
74HC244D 40 C to +125 C SO20 plastic small outline package; 20 leads; SOT163-1
74HCT244D body width 7.5 mm
74HC244DB 40 C to +125 C SSOP20 plastic shrink small outline package; 20 leads; SOT339-1
74HCT244DB body width 5.3 mm
74HC244PW 40 C to +125 C TSSOP20 plastic thin shrink small outline package; 20 leads; SOT360-1
74HCT244PW body width 4.4 mm
74HC244BQ 40 C to +125 C DHVQFN20 plastic dual-in-line compatible thermal enhanced SOT764-1
74HCT244BQ very thin quad flat package; no leads; 20 terminals;
body 2.5 4.5 0.85 mm
NXP Semiconductors 74HC244; 74HCT244
Octal buffer/line driver; 3-state
4. Functional diagram
1A0 1Y0
2 18
1A1 1Y1
4 16
1A2 1Y2
6 14
1A3 1Y3
8 12
1OE
1
2A0 2Y0
17 3
2A1 2Y1
15 5
2A2 2Y2
13 7
2A3 2Y3
11 9
2OE
19
mna875
Fig 1. Functional diagram
1
EN
2 18 17 3 2 18
1A0 1Y0 2A0 2Y0
4 16
4 16 15 5 6 14
1A1 1Y1 2A1 2Y1
8 12
6 14 13 7
1A2 1Y2 2A2 2Y2
19
EN
8 12 11 9
1A3 1Y3 2A3 2Y3
11 9
1 19
1OE 2OE 13 7
mna874 15 5
17 3
mna873
Fig 2. Logic symbol Fig 3. IEC logic symbol
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