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LS7166 Datasheet(PDF) 5 Page - LSI Computer Systems

Part # LS7166
Description  24-BIT QUADRATURE COUNTER
Download  15 Pages
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Manufacturer  LSI [LSI Computer Systems]
Direct Link  http://www.lsicsi.com
Logo LSI - LSI Computer Systems

LS7166 Datasheet(HTML) 5 Page - LSI Computer Systems

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DC Electrical Characteristics. (All voltages referenced to VSS.
TA = 0˚ to 85˚C, VDD = 3V to 5.5V, fc = 0, unless otherwise specified)
Parameter
Symbol
Min. Value
Max.Value
Unit
Remarks
Supply Voltage
VDD
3.0
5.5
V
-
Supply Current
IDD
-
350
µA
Outputs open
Input Low Voltage
VIL
0
0.8
V
-
Input High Voltage
VIH
2.0
VDD
V
-
Output Low Voltage
VOL
-
0.4
V
4mA Sink, VDD = 5V
Output High Voltage
VOH
2.5
-
V
200µA Source, VDD = 5V
Input Current
-
-
15
nA
Leakage
Current
Output Source Current
ISRC
200
-
µA
VOH = 2.5V, VDD = 5V
Output Sink Current
ISINK
4
-
mA
VOL = 0.4V, VDD = 5V
Data Bus Off-State
Leakage Current
-
-
15
nA
-
Absolute Maximum Ratings:
Parameter
Symbol
Values
Unit
Voltage at any input
VIN
VSS - 0.3 to VDD + 0.3
V
Operating Temperature
TA
-40 to +125
oC
Storage Temperature
TSTG
-65 to +150
oC
Supply Voltage
VDD - VSS
+7.0
V
7166-082906-5
I/O DESCRIPTION:
(See REGISTER DESCRIPTION for I/O Prgramming.)
Data-Bus (D0 - D7) (Pin 8 - Pin 15). The 8-line data bus is a
three-state I/O bus for interfacing with the system bus.
CS (Chip Select Input) (Pin 2). A logical "0" at this input enables
the chip for Read and Write.
RD (Read Input) (Pin 19). A logical "0" at this input enables the
OSR and the OL to be read on the data bus.
WR (Write Input) (Pin 1). A logical "0" at this input enables the
data bus to be written into the control and data registers.
C/D (Control/Data Input) (Pin 18). A logical "1" at this input en-
ables a control word to be written into one of the four control reg-
isters or the OSR to be read on the I/O bus. A logical "0" enables
a data word to be written into the PR, or the OL to be read on the
I/O bus.
A (Pin 6). Input A is a programmable count input capable of
functioning in three different modes, such as up count input, down
count input and quadrature input. In non-quadrature mode, the
counter advances on the rising edge of Input A.
B (Pin 7). Input B is also a programmable count input that can be
programmed to function either as down count input, or count
direction control gate for input A, or quadrature input. In non- quad-
rature mode, and when programmed as the Down Count input, the
counter advances on the rising edge of Input B. When B is pro-
grammed as the count direction control gate, B = 0 enables A as
the Up Count input and B = 1 enables A as the Down Count input.
When programmed as the direction input, B can switch state only
when A is high.
ABGT/RCTR (Pin 4). This input can be programmed to function
as either inputs A and B enable gate or as external counter reset
input. A logical "0" is the active level on this input. In non-
quadrature mode, if Pin 4 is programmed as A and B enable gate
input, it may switch state only when A is high (if A is clock and B
is direction) or when both A and B are high (if A and B are
clocks). In quadrature mode, if Pin 4 is programmed as A and B
enable gate, it may switch state only when either A or B switches.
LCTR/LLTC (Pin 3 ) This input can be programmed to function
as the external load command input for either the CNTR or the
OL. When programmed as counter load input, the counter is
loaded with the data contained in the PR. When programmed as
the OL load input, the OL is loaded with data contained in the
CNTR. A logical "0" is the active level on this input.
CY (Pin 16) This output can be programmed to serve as one of
the following:
A. CY. Complemented Carry out (active "0").
B. CY. True Carry out (active "1").
C. CYT. Carry Toggle flip-flop out.
D. COMP. Comparator out (active "0")
BW (Pin 17) This output can be programmed to serve as one of
the following:
A. BW. Complemented Borrow out (active "0").
B. BW. True Borrow out (active "1").
C. BWT. Borrow Toggle flip-flop out.
D. COMPT. Comparator Toggle output.
VDD (Pin 5) Supply voltage positive terminal.
VSS (Pin 20) Supply voltage negative terminal.


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