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74HCT595 データシート(PDF) 2 Page - NXP Semiconductors

部品番号 74HCT595
部品情報  8-bit serial-in/serial or parallel-out shift register with output latches; 3-state
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メーカー  PHILIPS [NXP Semiconductors]
ホームページ  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

74HCT595 データシート(HTML) 2 Page - NXP Semiconductors

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2003 Jun 25
2
Philips Semiconductors
Product specification
8-bit serial-in, serial or parallel-out shift
register with output latches; 3-state
74HC595; 74HCT595
FEATURES
• 8-bit serial input
• 8-bit serial or parallel output
• Storage register with 3-state outputs
• Shift register with direct clear
• 100 MHz (typical) shift out frequency
• ESD protection:
HBM EIA/JESD22-A114-A exceeds 2000 V
MM EIA/JESD22-A115-A exceeds 200 V.
APPLICATIONS
• Serial-to-parallel data conversion
• Remote control holding register.
DESCRIPTION
The 74HC/HCT595 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/HCT595 is an 8-stage serial shift register with a
storage register and 3-state outputs. The shift register and
storage register have separate clocks.
Data is shifted on the positive-going transitions of the
SH_CP input. The data in each register is transferred to
the storage register on a positive-going transition of the
ST_CP input. If both clocks are connected together, the
shift register will always be one clock pulse ahead of the
storage register.
The shift register has a serial input (DS) and a serial
standard output (Q7’) for cascading. It is also provided
with asynchronous reset (active LOW) for all 8 shift
register stages. The storage register has 8 parallel 3-state
bus driver outputs. Data in the storage register appears at
the output whenever the output enable input (OE) is LOW.
QUICK REFERENCE DATA
GND = 0 V; Tamb =25 °C; tr =tf = 6 ns.
Notes
1. CPD is used to determine the dynamic power dissipation (PD in µW).
PD =CPD × VCC2 × fi × N+ Σ(CL × VCC2 × fo) where:
fi = input frequency in MHz;
fo = output frequency in MHz;
CL = output load capacitance in pF;
VCC = supply voltage in Volts;
N = total load switching outputs;
Σ(CL × VCC2 × fo) = sum of the outputs.
2. For 74HC595 the condition is VI = GND to VCC.
For 74HCT595 the condition is VI = GND to VCC − 1.5 V.
SYMBOL
PARAMETER
CONDITIONS
TYPICAL
UNIT
74HC
74HCT
tPHL/tPLH
propagation delay
CL = 50 pF; VCC = 4.5 V
SH_CP to Q7’
19
25
ns
SH_CP to Qn
20
24
ns
MR to Q7’
100
52
ns
fmax
maximum clock frequency SH_CP and ST_CP
100
57
MHz
CI
input capacitance
3.5
3.5
pF
CPD
power dissipation capacitance per package
notes 1 and 2
115
130
pF


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