Integrated Circuits

74299
8-bit universal shift register; 3-state
PDF datasheet
       
S0 1  • 20 Vcc
OE 1 2 19 S1
OE 2 3 18 DSL
I/O6 4 17 Q7
I/O4 5 16 I/O7
I/O2 6 15 I/O5
I/O0 7 14 I/O3
Q0 8 13 I/O1
MR 9 12 CP
GND 10 11 DSR
       
Pin Symbol Description
1 S0 mode select input
2 OE 1 output enable (active low)
3 OE 2 output enable (active low)
4 I/O6 parallel data input/output
5 I/O4 parallel data input/output
6 I/O2 parallel data input/output
7 I/O0 parallel data input/output
8 Q0 serial output (standard output)
9 MR asynchronous master reset (active low)
10 GND ground
11 DSR serial data shift-right input
12 CP clock input (low-to-high, edge-triggered)
13 I/O1 parallel data input/output
14 I/O3 parallel data input/output
15 I/O5 parallel data input/output
16 I/O7 parallel data input/output
17 Q7 serial output (standard output)
18 DSL serial data shift-left input
19 S1 mode select input
20 Vcc supply voltage


Specifications
(typical values under recommended operating conditions, unless specified)
Parameter Value Unit
Propagation delay, CP to Q0, Q7 20 (74HC)
19 (74HCT) 		ns
Propagation delay, CP to I/On 20 (74HC)
19 (74HCT) 		ns
Propagation delay, MR to Q0, Q7, I/On 20 (74HC)
23 (74HCT) 		ns
Maximum clock frequency 50 (74HC)
46 (74HCT) 		MHz

Notes
  • S1 and S0 are low; hold (do nothing)
  • S1 is high and S0 is low; shift left (DSL →Q7, Q7 →Q6...)
  • S1 is low and S0 is high; shift right (DSR →Q0, Q0 →Q1...)
  • S1 and S0 are high; parallel load (I/On →Qn)

Note
Data is maintained by an independent source and accuracy is not guaranteed. Check with the manufacturer's datasheet for up-to-date information.

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