LS7166_06 LSI [LSI Computer Systems], LS7166_06 Datasheet - Page 5

• Manufacturer Part Number: LS7166_06
• Description: 24-BIT QUADRATURE COUNTER
• Manufacturer: LSI [LSI Computer Systems]

7166-082906-5
WR (Write Input) (Pin 1). A logical "0" at this input enables the
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.
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.
I/O DESCRIPTION:
(See REGISTER DESCRIPTION for I/O Prgramming.)
Absolute Maximum Ratings:
Voltage at any input
Operating Temperature
Storage Temperature
Supply Voltage
DC Electrical Characteristics. (All voltages referenced to V
T
Supply Voltage
Supply Current
Input Low Voltage
Input High Voltage
Output Low Voltage
Output High Voltage
Input Current
Output Source Current
Output Sink Current
Data Bus Off-State
Leakage Current
A
= 0˚ to 85˚C, V
Parameter
Parameter
DD
= 3V to 5.5V, fc = 0, unless otherwise specified)
Symbol
V
V
I
V
V
V
V
I
I
DD
-
SRC
SINK
-
DD -
DD
Symbol
IL
IH
OL
OH
T
V
T
STG
A
IN
V
SS
Min. Value
200
3.0
2.0
2.5
-
0
-
-
4
-
V
SS
Max.Value
SS
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:
BW (Pin 17) This output can be programmed to serve as one of
the following:
V
V
DD
SS
- 0.3 to V
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")
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.
.
-40 to +125
-65 to +150
5.5
350
0.8
V
0.4
15
Values
(Pin 20) Supply voltage negative terminal.
(Pin 5) Supply voltage positive terminal.
15
-
-
-
+7.0
DD
DD
+ 0.3
Unit
V
µA
V
V
V
V
nA
µA
mA
nA
Unit
V
V
o C
o C
Remarks
-
Outputs open
-
-
4mA Sink, V
200µA Source, V
Leakage
Current
V
V
-
OH
OL
= 0.4V, V
= 2.5V, V
DD
DD
DD
= 5V
= 5V
DD
= 5V
= 5V