PDW Marthel offers products from the following manufacturers:

select manufacturer --------- Winbond Luminary Micro Maruwa Joyin Bothhand Cosmo Edac Evalue GE Thermometrics Joyin Mascot Siward

Would you like to receive new product infos and updates? Please enter your email here:

add my e-mail remove my e-mail

• Memories
1. Can we use Flash W29C040-90 memory to replace W29C020-90 memory?
2. What is the meaning of electric erasure of EPROM Memory?
3. What are the advantages from application of electrically erasable EPROMs?
4. In which are the ALE EPROM Memories, types W27E520 and W27L520, different from other Winbond EPROMs?
5. My EPROM Programmer has no Winbond memories in its list. May I use it to program these devices? Are Winbond EPROMs compatible with EPROMs of other manufacturers?



---



• Microcontrollers
1. What are the differences between TURBO-51 microcontroller family and the remaining C51 standard compatible microcontrollers?
2. What is the purpose of "Wake Up" function available in some Windbond's 8-bit microcontrollers?
3. How does the In System Programming (ISP) function operate in Windbond's microcontrollers?
4. How are the program code memory banks selected in W77E532 microcontroller?



---



• Voice Record/Playback Devices (ISD)
1. What is the principle of Multilevel Storage Technology?
2. What are the benefits of using ISD Sound Devices?
3. Can ISD devices be operated from batteries?
4. What are the most important differences between various series of ISD devices?
5. I have equipment with ISD1016 and ISD1020 devices which are no longer manufactured. What can be done under such circumstances?
6. How to record sound from sound files to ISD devices?
7. How to eliminate knocks and sizzles which sometime appear at the beginning and at the end of messages played back?
8. What is the best attainable sound quality in ISD devices?
9. How to record sound to ISD devices from tape recorder, CD player or PC sound card?
10. Can we use ISD devices to record very low frequency signals below audio band?
11. I am using just one loudspeaker output SP+ to drive acoustic amplifier. What shall I do with the other loudspeaker output?
12. If two or more ISD devices are used in equipment, how they can be connected to a single loudspeaker?
13. I have several messages recorded in ISD2560 device. When I play back any of these messages, the circuit plays back this message and all other recorded after it until the end of memory. Why is this the case?
14. I have one long message recorded in ISD 2560 device. I am trying to start playing back with a short pulse applied to CE. The message may be played back once only. To play it back again I need to turn off and again on its power supply. Why is this the case?
15. In my equipment, the ISD25xx devices operate unreliably and intermittently. They record but sometimes they do not play back. Their power supply must be turned off then. What can be the reason?
16. The ISD33xxx series is not manufactured any longer. What other devices may be used instead?
17. Is it possible to operate ISD400x and ISD5xxx with +5V power supply voltage which is often the single supply voltage available in various equipment?
18. May the serial interface devices operate without any microcontroller?
19. Where will be placed the EOM marker within ISD4002-120 device's memory if the stoppage time of the device is 50 ms and the STOP instruction was loaded and latched at less than 50 ms before the end of currently played back/recorded row?



---