74HC_HCT4511_CNV_15 Datasheet, PDF (2/12 Pages) NXP Semiconductors – BCD to 7-segment latch/decoder/driver

Philips Semiconductors
BCD to 7-segment latch/decoder/driver
Product specification
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
• I_CC 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 (Q_a to Q_g).
When LE is LOW, the state of the segment outputs (Q_a to
Q_g) 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; T_amb = 25 °C; t_r = t_f = 6 ns
SYMBOL
t_PHL/ t_PLH
C_I
C_PD
PARAMETER
propagation delay
D_n to Q_n
LE to Q_n
BI to Q_n
LT to Q_n
input capacitance
power dissipation capacitance per latch
CONDITIONS
TYPICAL
HC
HCT
C_L = 15 pF; V_CC = 5 V
24
24
23
24
19
20
12
13
3.5
3.5
notes 1 and 2
64
64
Notes
1. C_PD is used to determine the dynamic power dissipation (P_D in µW):
P_D = C_PD × V_CC2 × f_i + ∑ (C_L × V_CC2 × f_o) where:
f_i = input frequency in MHz
f_o = output frequency in MHz
∑ (C_L × V_CC2 × f_o) = sum of outputs
C_L = output load capacitance in pF
V_CC = supply voltage in V
2. For HC the condition is V_I = GND to V_CC
For HCT the condition is V_I = GND to V_CC − 1.5 V
UNIT
ns
ns
ns
ns
pF
pF
December 1990
2