LS7031(2003) Ver la hoja de datos (PDF) - LSI Corporation
Número de pieza
componentes Descripción
Fabricante
LS7031 Datasheet PDF : 4 Pages
| |||
ELECTRICAL CHARACtERISTICS:
(VDD = VGG = OV, Vss = +4.75 to +15V, -25˚C ≤ TA ≤ +70˚C unless otherwise specified.)
PARAMETER
SYMBOL
MIN
MAX
UNITS
Count Test and Count frequency
(Vss = +5V ± 5%)
fc, ftc
DC
7.5
MHz
(Vss = +10V)
fc, ftc
DC
6
MHz
(Vss = +15V)
fc, ftc
DC
5
MHz
Scan frequency
fsc
DC
500
kHz
Count Pulse Width
(Pulse applied to B4/D2 or B8/D2;
‘OR’ combination ofB4/D2 and B8/D2)
(Vss = +5V ± 5%)
tcpw
(Vss = +10V)
tcpw
(Vss = +15V)
tcpw
**Propagation Delay
(B4/D2(H-L) to B8/D2 (L-H) at
Vss - 1.0V)
62
-
ns
83
-
ns
100
-
ns
Count Ripple Time
Load Pulse Width
Load Removal Time
Reset Pulse Width
Reset Removal Time
tcr
Overlap 10
ns
tlpw
4
-
µs
tlr
-
1
µs
trpw
4
-
µs
trr
-
1
µs
Rise and Fall Time
Count Pulse
Reset Pulse
Test Count Pulse
trfc
-
4
µs
trfr
-
4
µs
trftc
-
80
µs
*Strobe Guard Band time
tgb
(fSC ≤ 100kHz ≤ 250kHz)
*Strobe Guard Band time
tgb
(100kHz ≤ fSC ≤ 250kHz)
*Strobe Guard Band time
tgb
(250kHz ≤ fSC≤ 500kHz)
negative edge only
400
-
200
-
200
-
*Defines the minimum time from strobe edges to switching BCD data.
ns
ns
ns
The information included herein is believed to be
accurate and reliable. However, LSI Computer Systems,
Inc. assumes no responsibilities for inaccuracies, nor for
any infringements of patent rights of others which may
result from its use.
BCD
tgb
tgb
STROBE
FIGURE 2. GUARD BANDED STROBE
**Propagation Delay and Pulse Width
B4/D2
Vss - 1.0
tpr
B8/D2
B4/D2
or
B8/D2
tcpw
7031-012703-3
750MHz
PRESCALE
DIGIT 1
BCD CNTR 1
75MHz
PRESCALE
DIGIT 2
BCD CNTR 2
12 4 8
12 4 8
7.5MHz
B1/D1 - B8/D1
DIGIT STROBES
(MSD)
LS7031
B1/D1 - B8/D1
1 2 4 8 BLANK
(LSD)
Vss - 1.0
DIGIT DRIVERS
BCD TO SEVEN
SEGMENT
DECODER/DRIVER
ab cd efg
8 DIGIT DISPLAY
FIGURE 3. TYPICAL APPLICATION
Share Link: 