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PDU138
3-BIT PROGRAMMABLE DELAY LINE (SERIES PDU138)
FEATURES
* * * * * * * Digitally programmable in 8 delay steps Monotonic delay-versus-address variation Precise and stable delays Input & outputs fully TTL interfaced & buffered 2 10 T L fan-out capability Fits standard 16-pin DIP socket Auto-insertable
N/C N/C N/C IN OUT N/C EN/ GND
data 3 (R) delay devices, inc.
PACKAGES
1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 VCC N/C N/C N/C N/C A0 A1 A2
PDU138-xx PDU138-xxM
DIP Military DIP
FUNCTIONAL DESCRIPTION
The PDU138-series device is a 3-bit digitally programmable delay line. The delay, TDA, from the input pin (IN) to the output pin (OUT) depends on the address code (A2-A0) according to the following formula: TDA = TD0 + TINC * A
PIN DESCRIPTIONS
IN OUT A2 A1 A0 EN/ VCC GND Delay Line Input Non-inverted Output Address Bit 2 Address Bit 1 Address Bit 0 Output Enable +5 Volts Ground
where A is the address code, TINC is the incremental delay of the device, and TD0 is the inherent delay of the device. The incremental delay is specified by the dash number of the device and can range from 0.5ns through 50ns, inclusively. The enable pin (EN/) is held LOW during normal operation. When this signal is brought HIGH, OUT is forced into the LOW state. The address is not latched and must remain asserted during normal operation.
SERIES SPECIFICATIONS
* * * * * * * * Total programmed delay tolerance: 5% or 1ns, whichever is greater Inherent delay (TD0): 7ns typical (OUT) Setup time and propagation delay: Address to input setup (TAIS): 12ns typ. Disable to output delay (TDISO): 12ns typ. Operating temperature: 0 to 70 C Temperature coefficient: 100PPM/C (excludes TD0) Supply voltage VCC: 5VDC 5% Supply current: ICCH = 45ma ICCL = 20ma Minimum pulse width: 20% of total delay
DASH NUMBER SPECIFICATIONS
Part Number PDU138-.5 PDU138-1 PDU138-2 PDU138-5 PDU138-10 PDU138-12 PDU138-15 PDU138-20 PDU138-40 PDU138-50 Incremental Delay Per Step (ns) .5 .3 1 .4 2 .4 5 .6 10 1.0 12 1.2 15 1.3 20 1.5 40 2.0 50 2.5 Total Delay Change (ns) 3.5 1.0 7 1.0 14 1.0 35 1.8 70 3.5 84 4.2 105 5.3 140 7.0 280 14.0 350 17.5
NOTE: Any dash number between .5 and 50 not shown is also available. (c) 2002 Data Delay Devices
Doc #02004
5/6/02
DATA DELAY DEVICES, INC.
3 Mt. Prospect Ave. Clifton, NJ 07013
1
PDU138
APPLICATION NOTES
ADDRESS UPDATE
The PDU138 is a memory device. As such, special precautions must be taken when changing the delay address in order to prevent spurious output signals. The timing restrictions are shown in Figure 1. After the last signal edge to be delayed has appeared on the OUT pin, a minimum time, TOAX, is required before the address lines can change. This time is given by the following relation: TOAX = max { (Ai - A i-1) * TINC , 0 } where A i-1 and Ai are the old and new address codes, respectively. Violation of this constraint may, depending on the history of the input signal, cause spurious signals to appear on the OUT pin. The possibility of spurious signals persists until the required TOAX has elapsed. A similar situation occurs when using the EN/ signal to disable the output while IN is active. In this case, the unit must be held in the disabled state until the device is able to "clear" itself. This is achieved by holding the EN/ signal high and the IN signal low for a time given by: TDISH = Ai * TINC Violation of this constraint may, depending on the history of the input signal, cause spurious signals to appear on the OUT pin. The possibility of spurious signals persists until the required TDISH has elapsed.
INPUT RESTRICTIONS
There are three types of restrictions on input pulse width and period listed in the AC Characteristics table. The recommended conditions are those for which the delay tolerance specifications and monotonicity are guaranteed. The suggested conditions are those for which signals will propagate through the unit without significant distortion. The absolute conditions are those for which the unit will produce some type of output for a given input. When operating the unit between the recommended and absolute conditions, the delays may deviate from their values at low frequency. However, these deviations will remain constant from pulse to pulse if the input pulse width and period remain fixed. In other words, the delay of the unit exhibits frequency and pulse width dependence when operated beyond the recommended conditions. Please consult the technical staff at Data Delay Devices if your application has specific high-frequency requirements. Please note that the increment tolerances listed represent a design goal. Although most delay increments will fall within tolerance, they are not guaranteed throughout the address range of the unit. Monotonicity is, however, guaranteed over all addresses.
A2-A0 TAENS EN/ TENIS IN TDA OUT
A i-1 TOAX TAIS
Ai
PWIN
TDISH
PWOU
TDISO
Figure 1: Timing Diagram
Doc #02004
5/6/02
DATA DELAY DEVICES, INC.
Tel: 973-773-2299 Fax: 973-773-9672 http://www.datadelay.com
2
PDU138
DEVICE SPECIFICATIONS
TABLE 1: AC CHARACTERISTICS
PARAMETER Total Programmable Delay Inherent Delay Disable to Output Low Delay Address to Enable Setup Time Address to Input Setup Time Enable to Input Setup Time Output to Address Change Disable Hold Time Absolute Input Period Suggested Recommended Absolute Input Pulse Width Suggested Recommended SYMBOL TDT TD0 TDISO TAENS TAIS TENIS TOAX TDISH PERIN PERIN PERIN PWIN PWIN PWIN MIN TYP 7 7.0 12.0 UNITS TINC ns ns ns ns ns
2.0 12.0 12.0 See Text See Text 20 50 200 10 25 100
% of TDT % of TDT % of TDT % of TDT % of TDT % of TDT
TABLE 2: ABSOLUTE MAXIMUM RATINGS
PARAMETER DC Supply Voltage Input Pin Voltage Storage Temperature Lead Temperature SYMBOL VCC VIN TSTRG TLEAD MIN -0.3 -0.3 -55 MAX 7.0 VDD+0.3 150 300 UNITS V V C C NOTES
10 sec
TABLE 3: DC ELECTRICAL CHARACTERISTICS
(0C to 70C, 4.75V to 5.25V) PARAMETER High Level Output Voltage Low Level Output Voltage High Level Output Current Low Level Output Current High Level Input Voltage Low Level Input Voltage Input Clamp Voltage Input Current at Maximum Input Voltage High Level Input Current Low Level Input Current Short-circuit Output Current Output High Fan-out Output Low Fan-out SYMBOL VOH VOL IOH IOL VIH VIL VIK IIHH IIH IIL IOS MIN 2.5 TYP 3.4 0.35 MAX UNITS V V mA mA V V V mA A mA mA Unit Load NOTES VCC = MIN, IOH = MAX VIH = MIN, VIL = MAX VCC = MIN, IOL = MAX VIH = MIN, VIL = MAX
0.5 -1.0 20.0
2.0 0.8 -1.2 0.1 20 -0.6 -150 25 12.5
VCC = MIN, II = IIK VCC = MAX, VI = 7.0V VCC = MAX, VI = 2.7V VCC = MAX, VI = 0.5V VCC = MAX
-60
Doc #02004
5/6/02
DATA DELAY DEVICES, INC.
3 Mt. Prospect Ave. Clifton, NJ 07013
3
PDU138
PACKAGE DIMENSIONS
16
11 10
9
.410 MAX
4 5 7 8
.820 MAX
.020 TYP
.280 MAX .150 .030
.012 TYP .300 TYP
.018 TYP .700 TYP
.100 TYP
Commercial DIP (PDU138-xx)
16
11 10
9
.410 MAX
4 5 7 8
.820 MAX
.020 TYP
.320 MAX .150 .030
.012 TYP .300 TYP
.018 TYP .700 TYP
.100 TYP
Military DIP (PDU138-xxM)
Doc #02004
5/6/02
DATA DELAY DEVICES, INC.
Tel: 973-773-2299 Fax: 973-773-9672 http://www.datadelay.com
4
PDU138
DELAY LINE AUTOMATED TESTING
TEST CONDITIONS
INPUT: o o Ambient Temperature: 25 C 3 C Supply Voltage (Vcc): 5.0V 0.1V Input Pulse: High = 3.0V 0.1V Low = 0.0V 0.1V Source Impedance: 50 Max. Rise/Fall Time: 3.0 ns Max. (measured between 0.6V and 2.4V ) Pulse Width: PWIN = 1.5 x Total Delay Period: PERIN = 4.5 x Total Delay OUTPUT: Load: Cload: Threshold: 1 FAST-TTL Gate 5pf 10% 1.5V (Rising & Falling)
NOTE: The above conditions are for test only and do not in any way restrict the operation of the device.
COMPUTER SYSTEM
PRINTER
REF PULSE GENERATOR OUT TRIG IN DEVICE UNDER TEST (DUT) OUT IN TRIG TIME INTERVAL COUNTER
Test Setup
PERIN PWIN TRISE INPUT SIGNAL
2.4V 1.5V 0.6V
TFALL VIH
2.4V 1.5V 0.6V
VIL TDAF
TDAR OUTPUT SIGNAL VOH
1.5V
1.5V
VOL
Timing Diagram For Testing
Doc #02004
5/6/02
DATA DELAY DEVICES, INC.
3 Mt. Prospect Ave. Clifton, NJ 07013
5

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