MC145028P Freescale Semiconductor, MC145028P Datasheet - Page 14

• Manufacturer Part Number: MC145028P
• Description: IC DECODER 9 ADDR LINES 16-DIP
• Manufacturer: Freescale Semiconductor
• Series: 4000r
• Type: Encoder, Decoderr

Specifications of MC145028P

• Applications: Remote Control
• Voltage - Supply, Analog: 4.5 V ~ 18 V
• Voltage - Supply, Digital: 4.5 V ~ 18 V
• Mounting Type: Through Hole
• Package / Case: 16-DIP (0.300", 7.62mm)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

waveforms on C1 (Pin 7) and R2/C2 (Pin 10) as compared to
the incoming data waveform on D in (Pin 9).
before being reset to V DD . This point of reset (labelled “DOS”
in Figure 15) is the point in time where the decision is made
whether the data seen on D in is a 1 or 0. DOS should not be
too close to the D in data edges or intermittent operation may
occur.
MC145028 is on R2/C2 (see Figure 16). The R–C decay is
continually reset to V DD as data is being transmitted. Only
between words and after the end–of–transmission (EOT)
does R2/C2 decay significantly from V DD . R2/C2 can be used
to identify the internal end–of–word (EOW) timing edge which
is generated when R2/C2 decays to 2/3 V DD . The internal
EOT timing edge occurs when R2/C2 decays to 1/3 V DD .
When the waveform is being observed, the R–C decay
should go down between the 2/3 and 1/3 V DD levels, but not
too close to either level before data transmission on D in re-
sumes.
good match between the MC145026 transmitter and the
MC145027 and MC145028 receivers.
MC145026 MC145027 MC145028 SC41343 SC41344
14
To verify the MC145027 or MC145028 timing, check the
The R–C decay seen on C1 discharges down to 1/3 V DD
The other timing to be checked on the MC145027 and
Verification of the timing described above should ensure a
MC145027 AND MC145028 TIMING
R2/C2
D in
C1
V DD
V DD
0 V
0 V
V DD
2/3
1/3
0 V
2/3
1/3
Figure 16. R–C Decay on Pin 10 (R2/C2)
Figure 15. R–C Decay on Pin 7 (C1)
DOS
DOS
MOTOROLA
EOW
EOT