mc10e1651 ON Semiconductor, mc10e1651 Datasheet - Page 5

• Manufacturer Part Number: mc10e1651
• Description: 5 V, -5 V Dual Ecl Output Comparator With Latch
• Manufacturer: ON Semiconductor

the MC10E1651's compare and latch features. When the
signal on the LEN pin is at a logic high level, the device is
operating in the “compare mode,” and the signal on the input
arrives at the output after a nominal propagation delay (t
t
to the negative going transition on LEN and held for a time,
t
operating in the “latch mode,” thus transitions on the input
do not appear at the output. The device continues to operate
in the “latch mode” until the latch is asserted once again.
Moreover, the LEN pulse must meet the minimum pulse
width (t
relationship. Note that the LEN waveform in Figure 3.
shows the LEN signal swinging around a reference labeled
VBB
LEN follow typical ECL 10KH logic levels because
PLH
h
, after the LEN transition. After time t
VBB
The timing diagram (Figure 3.) is presented to illustrate
V
LEN
). The input signal must be asserted for a time, t
THR
INT
INT
Q
Q
V
pw
; this waveform emphasizes the requirement that
) requirement to effect the correct input‐output
V
IN
t
s
V
OD
Figure 3. Input/Output Timing Diagram
t
t
PHL
h
APPLICATIONS INFORMATION
h
, the latch is
s
http://onsemi.com
, prior
PHL
MC10E1651
,
5
VBB
nominally at the ECL V
the voltage level beyond the threshold level (V
the input is driven. As an example, if the threshold level is
set on one of the comparator inputs as 80 mV and the input
signal swing on the complementary input is from zero to
100 mV, the positive going overdrive would be 20 mV and
the negative going overdrive would be 80 mV. The result of
differing overdrive levels is that the devices have shorter
propagation delays with greater overdrive because the
threshold level is crossed sooner than the case of lower
overdrive levels. Typically, semiconductor manufactures
refer to the threshold voltage as the input offset voltage
(VOS) since the threshold voltage is the sum of the
externally supplied reference voltage and inherent device
offset voltage.
Finally, V
INT
is the internally generated reference level, hence is
OD
is the input voltage overdrive and represents
t
pw
t
PLH(LEN)
BB
level.
THR
) to which