DS1123LE-200 Maxim Integrated Products, DS1123LE-200 Datasheet - Page 8

• Manufacturer Part Number: DS1123LE-200
• Description: Delay Lines / Timing Elements 3.3V, 8-Bit, Program mable Timing Element
• Manufacturer: Maxim Integrated Products

Specifications of DS1123LE-200

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

3.3V, 8-Bit, Programmable Timing Element
The DS1123L is an 8-bit programmable delay line that
can be adjusted between 256 different delay intervals.
Because of the design (see Figure 1) of the DS1123L, it
is possible to delay a signal by a whole period or more,
which allows the phase of the signal to be adjusted up
to a full 360°. Programming may be done using either an
8-bit parallel interface or a 3-wire serial interface. Using
the 3-wire interface, it is possible to cascade multiple
devices together for systems requiring multiple pro-
grammable delays without using additional I/O
resources. The DS1123L also features a reference delay
that is approximately equal to the step-zero delay, which
can be used to realize small relative delays.
Additionally, the DS1123L can function as a monostable
vibrator or an adjustable frequency oscillator.
8
PIN
10
11
12
13
14
15
16
1
2
3
4
5
6
7
8
9
______________________________________________________________________
REF/PWM Reference Output/PWM Output
OUT/OUT Delay Output or Inverted Output
P1/CLK
NAME
P0/Q
GND
P2/D
V
P/S
MS
LE
P3
P4
P5
P6
P7
IN
CC
Input Signal to be Delayed, PWM
Trigger
Input-Latch Enable
Input P0 (Parallel Mode)/
Serial Data Output (Serial Mode)
Input P1 (Parallel Mode)/
Serial Clock (Serial Mode)
Input P2 (Parallel Mode)/
Serial Data Input (Serial Mode)
Input P3
Input P4
Ground
Input P5
Input Mode Select
MS = 0 for Delay Function,
MS = 1 for Oscillator or PWM
Input P6
Input P7
Parallel/Serial Programming Select
Power Supply (3.3V)
Detailed Description
Pin Description
FUNCTION
This section details how to program the DS1123L using
both the parallel and serial interfaces, using the refer-
ence delay, and how to configure the chip to function as
a monostable vibrator or adjustable frequency oscillator.
To enable the DS1123L’s parallel interface, P/S must be
connected to ground. This allows the data on the paral-
lel inputs (P0 to P7) to pass through the latch, which
are transparent when latch enable (LE) is at a high
input level. When LE is at a low level, the data is
latched until LE is returned to a high state. If the parallel
inputs are going to be used to hardwire a delay, LE
must be connected to V
Figure 1. DS1123L Conceptual Design
256 CONTROL
Using the Parallel Programming Interface
P1/CLK
P3-P7
P0/Q
P2/D
P/S
LE
IN
IN
LINES
DECODER
256 LINE
8-BIT LATCH VALUE
5
t
PROGRAMMABLE
D
8-BIT LATCH
REFERENCE
8-BIT INPUT
REGISTER
DELAY
DELAY
8
t
Functional Diagram
D
8
CC
DELAY CELLS
255 UNIT
Device Operation
to allow the setting to take
DS1123L
CONTROL
OUTPUT
MODE
t
D
t
D
REF/PWM
OUT/OUT
OUT
REF