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LS7060 Datasheet(PDF) 2 Page - LSI Computer Systems

Part No. LS7060
Description  32 BIT/DUAL 16 BIT BINARY UP COUNTER WITH BYTE MULTIPLEXED THREE-STATE OUTPUTS
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Maker  LSI [LSI Computer Systems]
Homepage  http://www.lsicsi.com
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LS7060 Datasheet(HTML) 2 Page - LSI Computer Systems

   
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SCAN COUNTER AND DECODER
The scan counter is reset to the least significant byte position
(State 1) when SCAN RESET input is brought low for a mini-
mum of 1µs. The scan counter is enabled for counting as long
as the ENABLE input is held low. The counter advances to the
next significant byte position on each negative transition of the
SCAN pulse. When the scan counter advances to State 5 it dis-
ables the Output Drivers and stops in that state until
SCAN RESET is again brought low.
SCAN
When the scan counter is enabled, each negative transition of
this input advances the scan counter to its next state. When
SCAN is low the Data Outputs are disabled. When SCAN is
brought high the Data Outputs are enabled and present the
latched counter data corresponding to the present state of the
scan counter. Therefore, in microprocessor applications, the
Data Output Bus may be utilized for other activities while new
data is propagating to the outputs. This positive SCAN pulse
can be viewed as a "Place the next byte on my bus" instruction
from the microprocessor. Minimum positive and negative pulse
widths of 500ns for the SCAN signal are required for scan
counter operation.
SCAN RESET/LOAD
When this input is brought low for a minimum of 1µs, the scan
counter is reset to State 1, the least significant byte position,
and the latches are simultaneously loaded with new count
information.
ENABLE
When this input is high, the scan counter and the Data Outputs are
disabled. When ENABLE is low, the scan counter and Data Out-
puts are enabled for normal operation. Transition of this input
should only be made while the SCAN input is in a low state in order
to prevent false clocking of the scan counter.
CASCADE ENABLE
This output is normally high. It transitions low and stays low when
the scan counter advances to State 5. In a multiple counter system
this output is connected to the ENABLE input of the next counter in
the cascade string. The SCAN input and SCAN RESET/LOAD in-
put are carried to all the counters in the "Cascade". Counter 1 then
presents its bytes of data to the Output Bus on each positive transi-
tion of the SCAN pulse as previously discussed. When State 5 of
Counter 1 is achieved, Counter 2 presents its data to the Output
Bus. This sequence continues until all counters in the cascade
have been addressed. See Figure 5 for an illustration of a 3 device
cascade design. This output is TTL and CMOS compatible.
THREE-STATE DATA OUTPUT DRIVERS
The eight Data Output Drivers are disabled when either ENABLE
input is high, the scan counter is in State 5, or the SCAN input is
low. The Output Drivers are TTL and Bus compatible.
ABSOLUTE MAXIMUM RATINGS:
PARAMETER
SYMBOL
VALUE
UNIT
StorageTemperature
TSTG
-55 to +150
°C
Operating Temperature
TA
0 to +70
°C
Voltage (any pin to VSS)
VIN
+10 to -0.3
V
DC ELECTRICAL CHARACTERISTICS:
(VDD = +5V ± 5%, VSS = 0V, TA = 0˚C to + 70˚C unless otherwise noted.)
PARAMETER
SYMBOL
Min
MAX
UNIT
CONDITIONS
Power Supply Current
IDD
-
15
mA
At Maximum Operating Frequency
VDD = Max, Outputs No Load
Input High Voltage
VIH
+3.5
VDD
V
-
Input Low Voltage
VIL
0
+0.6
V
-
Output High Voltage
CASCADE ENABLE
VOH
VDD-0.2
-
V
IO = 0, VDD = Min
+2.4
-
V
IO = -100µA, VDD = Min
B0 - B7
+2.4
-
V
IO = -260µA, VDD = Min
Output Low Voltage
+2.0
-
V
IO = 750µA, VDD = Min
CASCADE ENABLE
VOL
-
+0.2
V
IO = 0, VDD = Min
+0.4
V
IO = 1.6mA, VDD = Min
B0 - B7
+0.4
V
IO = 1.6mA, VDD = Min
Output Source Current
Isource
3.0
-
mA
VO = +1.2V, VDD = Min
B0 - B7 Outputs
4.8
-
mA
VO = +0.8V, VDD = Min
7.3
-
mA
VO = +0.4V, VDD = Min
Output Sink Current
Isink
5.7
-
mA
VO = +1.2V, VDD = Min
B0 - B7 Outputs
4.0
-
mA
VO = +0.8V, VDD = Min
2.2
-
mA
VO = +0.4V, VDD = Min
Output Leakage Current
IOL
-
1
µA
VO = +.4V to +2.4V,VDD = Min
B0 - B7 (Off State)
Input Capacitance
CIN
-
6
pF
TA = 25˚C, f = 1MHz
Output Capacitance
COUT
-
12
pF
TA = 25˚C, f = 1MHz
Input Leakage Current
ILI
-
1
µA
VDD = Max
ENABLE, RESET, SCAN
7060/62-071698-2
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.


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