September 2006
rev 0.2
PCS2P5T915A
Differential Input AC Test Conditions for LVEPECL
Symbol
VDIF
VX
VTHI
tR, tF
Parameter
Value
Units
mV
mV
V
V/nS
Input Signal Swing1
732
Differential Input Signal Crossing Point2
Input Timing Measurement Reference Level3
Input Signal Edge Rate4
1082
Crossing Point
1
Notes: 1. The 732mV peak-to-peak input pulse level is specified to allow consistent, repeatable results in an automatic test equipment (ATE) environment.
Compliant devices must meet the VDIF (AC) specification under actual use conditions.
2. A 1082mV crossing point level is specified to allow consistent, repeatable results in an automatic test equipment (ATE) environment. Compliant
devices must meet the VX specification under actual use conditions.
3. In all cases, input waveform timing is marked at the differential cross-point of the input signals.
4. The input signal edge rate of 1V/nS or greater is to be maintained in the 20% to 80% range of the input waveform.
DC Electrical Characteristics Over Operating Range for 2.5V LVTTL1
Symbol
Parameter
Test Conditions
Min
Typ8
Max
Unit
Input Characteristics
IIH
IIL
VIK
VIN
Input HIGH Current10
VDD= 2.6V VI = VDDQ/GND
VDD= 2.6V VI = GND/VDDQ
VDD= 2.4V, IIN = -18mA
±5
±5
- 1.2
+3.6
µA
Input LOW Current10
Clamp Diode Voltage
DC Input Voltage
- 0.7
V
V
-0.3
1.7
Single-Ended Inputs2
VIH
VIL
DC Input HIGH
DC Input LOW
V
V
0.7
Differential Inputs
VDIF
VCM
VIH
VIL
VREF
DC Differential Voltage3,9
0.2
1150
V
DC Common Mode Input
1250
1250
1350
mV
mV
mV
mV
Voltage4,9
DC Input HIGH5,6,9
DC Input LOW5,7,9
VREF+ 100
VREF- 100
Single-Ended Reference
Voltage5,9
Output Characteristics
IOH= -12mA
IOH= -100µA
IOL= 12mA
VDDQ- 0.4
VDDQ- 0.1
V
VOH
Output HIGH Voltage
V
V
V
0.4
0.1
VOL
Output LOW Voltage
I
OL= 100µA
Notes: 1. See RECOMMENDED OPERATING RANGE table.
2. For 2.5V LVTTL single-ended operation, the RxS pin is tied HIGH and A/VREF is tied to GND.
3. VDIF specifies the minimum input differential voltage (VTR - VCP) required for switching where VTR is the "true" input level and VCP is the
"complement" input level. Differential mode only. The DC differential voltage must be maintained to guarantee retaining the existing HIGH or LOW
input. The AC differential voltage must be achieved to guarantee switching to a new state.
4. VCM specifies the maximum allowable range of (VTR + VCP) /2. Differential mode only.
5. For single-ended operation, in differential mode, A/VREF is tied to the DC voltage VREF
.
6. Voltage required to maintain a logic HIGH, single-ended operation in differential mode.
7. Voltage required to maintain a logic LOW, single-ended operation in differential mode.
8. Typical values are at VDD = 2.5V, VDDQ = VDD, +25°C ambient.
9. The reference clock input is capable of HSTL, eHSTL, LVEPECL, 1.8V or 2.5V LVTTL operation independent of the device output. The correct input
interface table should be referenced.
10. For differential mode (RxS = LOW), A and A/VREF must be at the opposite rail.
Low Voltage (2.5V) High Accuracy 1:5 Clock Fan-Out Buffer
9 of 23
Notice: The information in this document is subject to change without notice.
PULSECORE [ PulseCore Semiconductor ]
