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參數(shù)資料
| 型號： | 933713550653 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 計數(shù)移位寄存器 |
| 英文描述： | HCT SERIES, 8-BIT BIDIRECTIONAL PARALLEL IN PARALLEL OUT SHIFT REGISTER, TRUE OUTPUT, PDSO20 |
| 封裝： | SOT-163, SO-20 |
| 文件頁數(shù)： | 4/11頁 |
| 文件大小： | 79K |
| 代理商： | 933713550653 |
December 1990
2
Philips Semiconductors
Product specication
8-bit universal shift register; 3-state
74HC/HCT299
FEATURES
Multiplexed inputs/outputs provide improved bit density
Four operating modes:
– shift left
– shift right
– hold (store)
– load data
Operates with output enable or at high-impedance
OFF-state (Z)
3-state outputs drive bus lines directly
Can be cascaded for n-bits word length
Output capability: bus driver (parallel I/Os),
standard (serial outputs)
ICC category: MSI
GENERAL DESCRIPTION
The 74HC/HCT299 are high-speed Si-gate CMOS devices
and are pin compatible with low power Schottky TTL
(LSTTL). They are specified in compliance with JEDEC
standard no. 7A.
The 74HC/HCT299 contain eight edge-triggered D-type
flip-flops and the interstage logic necessary to perform
synchronous shift-right, shift-left, parallel load and hold
operations. The type of operation is determined by the
mode select inputs (S0 and S1), as shown in the mode
select table.
All flip-flop outputs have 3-state buffers to separate these
outputs (I/O0 to I/O7) such, that they can serve as data
inputs in the parallel load mode. The serial outputs (Q0 and
Q7) are used for expansion in serial shifting of longer
words.
A LOW signal on the asynchronous master reset input
(MR) overrides the Sn and clock (CP) inputs and resets the
flip-flops. All other state changes are initiated by the rising
edge of the clock pulse. Inputs can change when the clock
is either state, provided that the recommended set-up and
hold times, relative to the rising edge of CP, are observed.
A HIGH signal on the 3-state output enable inputs (OE1 or
OE2) disables the 3-state buffers and the I/On outputs are
set to the high-impedance OFF-state. In this condition, the
shift, hold, load and reset operations can still occur. The
3-state buffers are also disabled by HIGH signals on both
S0 and S1, when in preparation for a parallel load
operation.
QUICK REFERENCE DATA
GND = 0 V; Tamb =25 °C; tr =tf = 6 ns
SYMBOL
PARAMETER
CONDITIONS
TYPICAL
UNIT
HC
HCT
tPHL/ tPLH
propagation delay
CL = 15 pF; VCC =5 V
CP to Q0, Q7
20
19
ns
CP to I/On
20
19
ns
tPHL
MR to Q0, Q7 or I/On
20
23
ns
fmax
maximum clock frequency
50
46
MHz
CI
input capacitance
3.5
pF
CI/O
input/output capacitance
10
pF
CPD
power dissipation capacitance per package
notes 1 and 2
120
125
pF
Notes
1. CPD is used to determine the dynamic power
dissipation (PD in W):
PD =CPD × VCC2 × fi + ∑ (CL × VCC2 × fo) where:
fi = input frequency in MHz
fo = output frequency in MHz
∑ (CL × VCC2 × fo) = sum of outputs
CL = output load capacitance in pF
VCC = supply voltage in V
2. For HC the condition is VI = GND to VCC
For HCT the condition is VI = GND to VCC 1.5 V
ORDERING INFORMATION
See
“74HC/HCT/HCU/HCMOS Logic Package
Information”.
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