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74HCT4511D bảng dữ liệu(PDF) 2 Page - NXP Semiconductors

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Giải thích chi tiết về linh kiện  BCD to 7-segment latch/decoder/driver
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December 1990
2
Philips Semiconductors
Product specification
BCD to 7-segment latch/decoder/driver
74HC/HCT4511
FEATURES
• Latch storage of BCD inputs
• Blanking input
• Lamp test input
• Driving common cathode LED displays
• Guaranteed 10 mA drive capability per output
• Output capability: non-standard
• ICC category: MSI
GENERAL DESCRIPTION
The 74HC/HCT4511 are high-speed Si-gate CMOS
devices and are pin compatible with “4511” of the “4000B”
series. They are specified in compliance with JEDEC
standard no. 7A.
The 74HC/HCT4511 are BCD to 7-segment
latch/decoder/drivers with four address inputs (D1 to D4),
an active LOW latch enable input (LE), an active LOW
ripple blanking input (BI), an active LOW lamp test input
(LT), and seven active HIGH segment outputs (Qa to Qg).
When LE is LOW, the state of the segment outputs (Qa to
Qg) is determined by the data on D1 to D4.
When LE goes HIGH, the last data present on D1 to D4 are
stored in the latches and the segment outputs remain
stable.
When LT is LOW, all the segment outputs are HIGH
independent of all other input conditions. With LT HIGH, a
LOW on BI forces all segment outputs LOW. The inputs LT
and BI do not affect the latch circuit.
APPLICATIONS
• Driving LED displays
• Driving incandescent displays
• Driving fluorescent displays
• Driving LCD displays
• Driving gas discharge displays
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 +∑ (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
SYMBOL
PARAMETER
CONDITIONS
TYPICAL
UNIT
HC
HCT
tPHL/ tPLH
propagation delay
CL = 15 pF; VCC =5 V
Dn to Qn
24
24
ns
LE to Qn
23
24
ns
BI to Qn
19
20
ns
LT to Qn
12
13
ns
CI
input capacitance
3.5
3.5
pF
CPD
power dissipation capacitance per latch
notes 1 and 2
64
64
pF


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